That's fact that should be known by everyone, so calling it "first" character and then calling first character "zero" character might be confusing, I wouldn't do that :), i know that line[0] is the first. You've got lots of problems with the code you posted. First: printf("[%d]->[%d]\n", (int)t->key,(int)t->value); This scheme is very commonly used with thread pool workers. Asking for help, clarification, or responding to other answers. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, yes sorry about that. See here: http://www.cplusplus.com/reference/cstdio/printf/. What are the differences between a pointer variable and a reference variable? intptr_t: All this under the assumption you really want to convert the wrong-sized integer to a pointer. is a char. cast to pointer from integer of different size -wint-to-pointer-cast. func is returning an integer that is being stored in a pointer; ptr is later cast to an integer and used as an integer. How many transistors at minimum do you need to build a general-purpose computer? while loop keep printing and repeating, what is wrong with my getch? This is wrong, since characters are not addresses this assignment makes no sense. takes the second character (line[1]) and casts it to the pointer to char, which is incorrect. as 4-byte pointers using the PTR32ATT attribute or one of the predefined 4-byte pointer types. I'm not sure if this is what you want. I wouldn't suggest a double cast. The good way would be to send a true pointer. -1, the first and second characters really aren't at those indices. How do I create a static implicit rule in a Makefile? cast to pointer from integer of different size [-Wint-to-pointer-cast] Submitted: 2018-02-27 18:22 UTC: Modified: 2018-02-27 18:45 UTC: Votes: 4: Avg. is a pointer to char, as is (char *)b+4 but then * ( (char *)b+4) is dereferencing (char *)b+4, so that's type char -- and you're then trying to cast that thing, which is probably 1 byte, Does a 120cc engine burn 120cc of fuel a minute? i know it's weird, but it helped me remember the positions. The second one isn't going to be any better. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks for contributing an answer to Stack Overflow! Thanks for contributing an answer to Stack Overflow! How could my characters be tricked into thinking they are on Mars? Is MethodChannel buffering messages until the other side is "connected"? Do non-Segwit nodes reject Segwit transactions with invalid signature? The reinterpret_cast take the value and casts it to the type and size of pointer given. warning: cast from pointer to integer of different size MacOS X 64 int i will edit it. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? In that case, you must ensure that the computation performed by func works in the new architecture. Mathematica cannot find square roots of some matrices? Yes, thank you! Ready to optimize your JavaScript with Rust? rev2022.12.11.43106. Asking for help, clarification, or responding to other answers. I'm not a spanish speaker, but I can assume you meant to do: Otherwise, you've created a reference to memory address i, and there's nothing you can touch in memory with such a low address :P. Also, casting explicitly to and from void pointers is a something to avoid. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? How can I use a VPN to access a Russian website that is banned in the EU? Reassigning const char array with unknown size, Modular programming in C (nested headers), While loop runs automatically after calling a method with a switch statement in C, Want to notedown CPU usage and Memory Usage of my C program, why does this error occur: 'conio.h' file not found. A solution using dynamic allocated memory for the value would look something like this: While this solution is more "correct", it is less readable which means it's less maintainable; It has more code which means more chances of errors; And it has the possibility of a memory leak if the free call is forgotten (which sooner or later will happen). Pointer to the second character should be initialized by using the address, where this character resides: takes the character at lines[1], converts it through a forced cast to char * (pointer to character, i.e. Here you have allocated the node, but you have not allocated anything to hold the contents. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? 1 - warning: cast from pointer to integer of different size . How to check if widget is visible using FlutterDriver. What does this mean, and what should I do to fix it? This type has the same size of a pointer (not int) in every architecture. How can I fix it? If you want to point the the address of line[1] and line[2] you would do the &line[] as describe above and you will not have to use reinterpret_cast to stop the warning messages about size: The first will be pointing to 0x000002 @ugoren, I would choose the alternative :-) Casting is often used to "hush that pesky compiler! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. ], int is only a 32-bit value, regardless of what architecture you're on. this fixed-width integer reference. Second, did you want to put the address of line[0] into first? Assuming it's the cast of the i variable that causes the problem, first cast it to an integer type that is larger than int and at the same time large enough to hold a pointer. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. My understanding is that these are very serious warnings since it could result in pointers being corrupted. It first casts void *to uintptr_t(same size, no warning), then uintptr_tto int(number to number, no warning). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If func is using signed integer types, consider the sign bit too. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Find centralized, trusted content and collaborate around the technologies you use most. What it sounds like: something is wrong in your pointers. That's because the thread function is declared (and specified) to return a pointer. To convert a char* to an int in C, you don't cast the pointer. i know it's weird. In my program, I know that the value stored at ((char *)b +4) is itself another pointer, and I want to store this pointer in 'a'. you are setting your key as a pointer to the contents of address 3, and the value as a pointer to the contents of address 5). What happens if you score more than 99 points in volleyball? The message in codeblocks is: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast] note: my compiler options are -std=c99 -Werror -save I'm not sure what you expected to happen, but you are storing the ADDRESS not the VALUE. Is it appropriate to ignore emails from a student asking obvious questions? https://www.tutorialspoint.com/cprogramming/c_pointers.htm. When printing pointers, print pointers. ], If you're not averse to using unsigned integers, it might be easier to use uint_64t or something like that, which will avoid the 64-bit to 32-bit assignment (uint_64t is an unsigned 64-bit int). Does illicit payments qualify as transaction costs? the OP will also have to be careful not to do something like this in a function. The best way to do this is by using the intptr_t type. Not the answer you're looking for? Irreducible representations of a product of two groups. Pointers have varying sizes, on 64 bit systems for example they can be expected to be 64bit. To learn more, see our tips on writing great answers. I'm assuming (char **) means it's a pointer to a pointer? Note the "without a cast" part. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You should not try to do threading before understand basic C. I don't think is a good idea to show this. but then *((char *)b+4) is dereferencing (char *)b+4, so that's type char -- and you're then trying to cast that thing, which is probably 1 byte, into a 4 or 8 byte address. Does integrating PDOS give total charge of a system? cast from pointer to integer of different size [-Wpointer-to-int-cast] I want to calculate the image size in colors in (Mo) and in black and white in (Ko) so for this I'm using a Fixed by #9125 Contributor mbiebl commented on Jan 2, 2018 Submission type Bug report systemd version the issue has been seen with v236 Used distribution When compiling systemd on i386 I get the following warnings Not the answer you're looking for? PSE Advent Calendar 2022 (Day 11): The other side of Christmas. It is likely this code was originally written for a system where the integer type returned by func had the same size as the pointer type, but you are now compiling on a system where the pointer type is larger or less than that integer size. Making statements based on opinion; back them up with references or personal experience. Cast from a pointer to an integer of a different size Problem: I received the following warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] Solution: The GNU Compiler Collection (GCC) 4.6.3 issues a warning when you cast a In the second case, it's less of an issue but to deal with endianness issues you should cast through intptr_t: some_struct *ptr = (some_struct *)(intptr_t)func(); and later int value = (int)(intptr_t)ptr;. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address. In the thread function you do the opposite, first cast to intptr_t and then to int. Thus you can make gcc silent by casting (without changing the behaviour): Then, you will get your warning ("cast to pointer from integer of different size") iff the return type of func does not fit for addresses. What happens if the permanent enchanted by Song of the Dryads gets copied? Probably, reworking the code is a better idea. Cast to pointer from integer of different size. Making statements based on opinion; back them up with references or personal experience. Why do quantum objects slow down when volume increases? Not returning a value from a function declared to do so leads to undefined behavior. Thanks for contributing an answer to Stack Overflow! Syntax and Sample Usage of _Generic in C11, How to use native C library in flutter package, How to call a named constructor from a generic function in Dart/Flutter, Generic TypeDef does not work with custom class, compiler warning - cast from pointer to integer of different size. . Copyright 2022 www.appsloveworld.com. Warning in C: assignment makes integer from pointer without a cast, "assignment makes integer from pointer without a cast " warning in c, Assignment makes integer from pointer without a cast warning, I'm getting warning "cast to pointer from integer of different size", How to fix " assignment makes pointer from integer without a cast [-Wint-conversion]"? Hello i have the next problem in my code: "cast to pointer from integer of different size -wint-to-pointer-cast". Unless you add an enum field or something that stores the type of value stored at the pointer location-- but that kind of defeats the purpose. This is an example of what my code looks like: The value that (b+4) is pointing to is an address that I want to store in a. rawsocket.c:90: warning: cast to pointer from integer of different size rawsocket.c:91: warning: cast to pointer from integer of different size I sort of hacked it up. this * fetch the value stored at b+4 address & it is assigned to a which is wrong rev2022.12.11.43106. C unix program, Different executables from different cds run always the same code, what is the time and space complexity of this function. The only alternative is to design the data structures differently, which is better, but not always applicable. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Envelope of x-t graph in Damped harmonic oscillations. Use %p. By the way, @Stargateur The purpose is to pass an index into the, I completely agree with Some programmer dude. In my program, I know that the value stored at ((char *)b + 4) is itself another pointer, and I want to store this pointer in 'a'. You need to include to have the uintptr_t type (an integral type with the same size as a pointer). If he had met some scary fish, he would immediately return to the surface. The mapping functions for converting a pointer to an integer or an integer to a pointer are intended to be consistent with the addressing structure of the execution environment. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The compiler tries to warn you that you lose bits when casting from void * to int. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? What is a smart pointer and when should I use one? Ready to optimize your JavaScript with Rust? Copyright 2022 Educative, Inc. All rights reserved. How do I put three reasons together in a sentence? Year-End Discount: 10% OFF 1-year and 20% OFF 2-year subscriptions!Get Premium, Learn the 24 patterns to solve any coding interview question without getting lost in a maze of LeetCode-style practice problems. These errors occur because the casts are not correct. and Why / when to use `intptr_t` for type-casting in C?. How can you know the sky Rose saw when the Titanic sunk? Why should I use a pointer rather than the object itself? For example, if the pointers in a system are stored in 16 bits, but integers are stored in 8 bits, a total of 8 bits would be lost in the given conversion. Many still look down on such a solution, but still use it since it's easier than the whole malloc-copy-free circus that's otherwise needed. Counterexamples to differentiation under integral sign, revisited, Why do some airports shuffle connecting passengers through security again. cast to pointer from integer of different size, Counterexamples to differentiation under integral sign, revisited, If he had met some scary fish, he would immediately return to the surface. rev2022.12.11.43106. I've patched off of the warnings on x86_64 darwin with the changes below --- openmotif-2.3.2/lib/Xm/DragBS.c.org 2009-08-29 10:27:40.000000000 -0400 By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Connect and share knowledge within a single location that is structured and easy to search. Cast from a pointer to an integer of a different size Problem: I received the following warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] Solution: The GNU int var Because at -m32, you have ILP32, and at -m64, you get LP64, and it's only when pointers are bigger than ints that you'll get the warning, and longs are the same size as pointers in both cases. Post by Jack Howarth and why it is different at -m64. How to fix: passing argument 1 of 'sutuntopla' makes pointer from integer without a cast warning? What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Asking for help, clarification, or responding to other answers. Bug#622206: libomxvorbis: FTBFS on *64: cast from pointer to integer of different size. Your node just holds some pointers (ADDRESSES), it doesn't hold any VALUES. One To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What does "cast to pointer from integer of different size" mean? it helps me remember, @user1665569: Second character is stored at index 1. It is defined as follows : Integer type capable of holding a value converted from a void pointer and then be converted back to that type with a value that compares equal to the original pointer. I personally prefer to make the conversion explicit and easy to verify by using macros (in the hopes that learners notice the issue); in this case, perhaps. You need to Did neanderthals need vitamin C from the diet? Want to know which application is best for the job? Having a problem installing a new program? Relative addressing in x86 assembly (intel flavor), are offsets given relative to the top or bottom of the "slot"? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, The most efficient way to implement an integer based power function pow(int, int). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint * egint reg=0xFF00FF00 Why do we use perturbative series if they don't converge? Why / when to use `intptr_t` for type-casting in C? It's a /pointer/ to StackFrame. How to change background color of Stepper widget to transparent color? Not the answer you're looking for? A double cast would solve this (int) (uintptr_t)t->key. Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. then I try to call the function client_create_no_window by first doing, I keep getting the error casting to pointer from integer of different size. Type-safe generic data structures in plain-old C? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. You've got lots of problems with the code you posted. cast to pointer from integer of different size [-Wint-to-pointer-cast] hashibiro 10 3 0 0 7033 2021/05/22 17:59 intpointercastreturnvoid *cast c How to resolve this cast to pointer of a different size warning? rev2022.12.11.43106. Linux - SoftwareThis forum is for Software issues. When printing pointers, print poin Thank you for the clarification. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Connect and share knowledge within a single location that is structured and easy to search. To learn more, see our tips on writing great answers. You're converting i to a void pointer without creating a reference to it. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. The code below works but I'm getting a compiler warning about the cast from pointer to integer. A double cast would solve this (int)(uintptr_t)t->key. i2c_arm bus initialization and device-tree overlay, Why do some airports shuffle connecting passengers through security again, Counterexamples to differentiation under integral sign, revisited. The first one wasn't necessarily necessary. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? What does "dereferencing" a pointer mean? Connect and share knowledge within a single location that is structured and easy to search. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Ready to optimize your JavaScript with Rust? Not sure if it was just me or something she sent to the whole team. Why does the USA not have a constitutional court? We and our partners share information on your use of this website to help improve your experience. [3/8] exynos_fimg2d: fix cast from pointer to integer of different size Message ID 1393995704-29184-4-git-send-email-djkurtz@chromium.org ( mailing list archive ) error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast] 1 answer 10 views. The reinterpret_cast take the value and casts it to the type and size of pointer given. Sometimes there are valid reasons to work with addresses as integers (e.g., dealing with alignment issues in special code). i actually name variables zero, first, and second. Copyright 2022 Educative, Inc. All rights reserved. For those curious, while I would normally not recommend casting an integer to a pointer like this, there are exceptions to everything and this is one of the few cases (if not the only one) where such a cast is acceptable. One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address.] int is only a 32-bit value, regard @JoshPetitt, For overcoming strict compiler warnings, the double cast may be necessary. This type has the same size of a pointer (not int) in every architecture. Irreducible representations of a product of two groups. That's the important bit. Maybe would be better to create an array of integer to show a better way. In the first case, the return value from func will lose information , and potentially How can one print a size_t variable portably using the printf family? What is a smart pointer and when should I use one? just a typo. Are the S&P 500 and Dow Jones Industrial Average securities? Please let me know if there is a proper way to do this. @David: See my update please, I think that's what you're after if I'm understanding you. I'm trying to create a struct that can hold generic values. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. Now I understand what I did, but my goal is not for 'a' to point to an address 4 bytes greater than 'b'. CGAC2022 Day 10: Help Santa sort presents! One such type, designed for the very purpose of being large enough to hold any integer or pointer, is intptr_t, described in e.g. Like @JonathanLeffler said, use uintptr_t. Concentration bounds for martingales with adaptive Gaussian steps. The best way to do this is by using the intptr_t type. Practice your skills in a hands-on, setup-free coding environment. i actually name variables zero, first. Why is the federal judiciary of the United States divided into circuits? Does a 120cc engine burn 120cc of fuel a minute? The ints would be "on the stack" and invalid once the function returns. This is on a 64-bit system. Instead you use atoi. You need to include to have the uintptr_ttype (an integral type I am receiving following warnings while compiling my code using gcc. uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint If its computations can be done with pointers, then do them with pointers and return pointers. That would be: Notice the first and second characters are at indexes 0 and 1, respectively. The second will be pointing to 0x234234. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. pthread_join:warning: cast from pointer to integer of different size? Post your question in this forum. it helps me remember. All rights reserved. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Solution 1 A quick hacky fix might just to cast to long instead of int. Second character (line[1]) is stored in the memory at address that can be retrieved by using the "address of" operator (&): &line[1]. Hence, a warning is issued.. Ergo, mismatched sizes. Cast to pointer from integer of different size error, Passing argument as int to thread - Warning: cast to pointer from integer different size, Dlsym: cast to pointer from integer of different size, compilation error: cast from pointer to integer of different size, cast to pointer from integer of different size, mud compile - warning: cast from pointer to integer of different size, Warning: cast to pointer from integer of different size, cast to pointer from integer of different size [-Wint-to-pointer-cast], converting argv[3] to int for port number: cast from pointer to integer of different size, Pro*C to C: cast to pointer from integer of different size [-Wint-to-pointer-cast] and note: in definition of macro 'TEND', Passing Argument 1 makes integer from pointer without a cast warning, Using function pointer, but got warning makes pointer from integer without a cast [-Wint-conversion], Different size pointer cast warning in ARM64 system, format %lu expects argument of type 'long unsigned int' but argument 3 has type long long unsigned int, cast from printer to integer of different size. reinterpret_cast fixes that. Making statements based on opinion; back them up with references or personal experience. And in serverThread, the received void*is cast to int, resulting in the warning about the cast from pointer to It would also be strange because there is no cast in your code. When I try to compile, I get "warning: cast to pointer from integer of different size." Concentration bounds for martingales with adaptive Gaussian steps, Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup), Central limit theorem replacing radical n with n. Is energy "equal" to the curvature of spacetime? hans April 23, 2021, 7:33pm #1. A better idea might be to use intptr_t. Then you proceed to cast that char to a void* and the compiler complains. thank you, i know that line[0] is the first. It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). (There is also intptr_t if signed arithmetic is better for some reason, but I generally find the unsigned uintptr_t to be less troublesome.) cast from pointer to integer of different size when compiling on x86_64-apple-darwn9/10. I'm still pretty new to C, so dealing with pointers is confusing for me. Finally, your compiler is right in warning you. Cast to pointer from integer of different size, Cast to pointer from integer of different size (passing int as a const void * parameter), Avoid "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] " in a _generic macro. warning: cast from pointer to integer of different size Solution:Ensure that all pointers are defined correctly. Also note that I return a NULL at the end of the function. If you have ensured that the value returned by func is correct, then you can use explicit casts, such as: some_struct *ptr = (some_struct *) (intptr_t) func();. Was the ZX Spectrum used for number crunching? My work as a freelance was used in a scientific paper, should I be included as an author? defines an array of characters. The compiler issues the cast from integer to pointer of different size warning whenever the value of an integer is converted to a pointer, especially when the memory allocated to a pointer is smaller than the memory allocated to an integer data type. Why does Cauchy's equation for refractive index contain only even power terms? Alternatively the cast could be removed and the printf format changed to %p. Thanks for contributing an answer to Stack Overflow! It doesn't know that the void * is actually an int cast, so the lost bits are meaningless. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Using flutter mobile packages in flutter web. I did this for you and get: seems like you wrote an asterisk too much. You don't have to manually cast to void* in C so just this should do: Update for comments: Sounds like you're after this: it would improve the readability, if you wrote the statements apart First, if you can fix func (are allowed to modify its source), then fix it. cast from pointer to integer of different size [-Wpointer-to-int-cast]. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to make voltage plus/minus signs bolder? whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. (i.e. - void* [] [ long long -> void* -> long long 32 ]) In the older compilers just doing the char *ptr = (char *)23 was good enough but the new compilers know a int (23 would be stored in a int) is not the size of a pointer (normally 64 bits) and it generates the warning message. Why is there an extra peak in the Lomb-Scargle periodogram? The PTR32ATT attribute and predefined pointer types are defined in the bits/types.hheader file Bug #76021: cast to pointer from integer of different size [-Wint-to-pointer-cast] Submitted: 2018-02-27 18:22 UTC: Modified: 2021-08-18 10:54 UTC Preferably, func should convert the uintptr_t to a pointer when returning it, so the return type of func would be a pointer (to something, perhaps some_struct or void). No address that func should calculate ever exceeds the maximum value of the integer type it uses? i know that line[0] is the first. How can I fix it? What does "assignment makes pointer from integer without a cast" mean? It's impossible to absolutely know what the value being stored by that pointer is unless you can guarantee that you set the pointer and it's value/type is unchanged. . Should teachers encourage good students to help weaker ones? The compiler tries to warn you that you lose bits when casting from void * to int . It doesn't know that the void * is actually an int cast, How do I put three reasons together in a sentence? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? To learn more, see our tips on writing great answers. I've looked at some of the previous posts on these but still cant understand why this is going on. On a lot of systems, sizeof (long) == sizeof (void *). If you were to use such an implementation, the program wouldn't work. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Improve INSERT-per-second performance of SQLite. How to find the size of an array (from a pointer pointing to the first element array)? However, be very very careful when doing things like this. Do bracers of armor stack with magic armor enhancements and special abilities? The possible difference in size is only part of the problem. Note that I changed the signature of the thread function to be correct, it takes a void * argument, and this makes a whole lot difference on systems where sizeof(int) != sizeof(void *), which seems to be true in your case. Do bracers of armor stack with magic armor enhancements and special abilities? Not the answer you're looking for? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Add a new light switch in line with another switch? MOSFET is getting very hot at high frequency PWM. There is a chance you are losing precision. cast from pointer to integer of different size: what is the problem??? However, this particular error message is telling you that you are not merely converting an integer to a pointer, but that you are converting an integer of one size (e.g., four bytes) to a pointer of another size (e.g., eight bytes). The warning of cast from pointer to integer of different size occurs when you try to save the value of an integer to a pointer variable, as demonstrated in the code below. See GLib Type Conversion Macros for a discussion of the issue. What you want is probably the address of that character, which you can get by using the "address of" operator, &: which can also be written using pointer arithmetic as: Note, however, that C indexes from zero, so the first character is really at lines[0]: First, I'm sure it's just a typo, but you declared char lines[] instead of char line[]. That part of the problem can be solved by using uintptr_t, a type defined in and . Compile Error in C: error: expected expression before . token. If you cannot fix func, then you can use casts to tell the compiler that you intend to do the conversions that are being performed. Received a 'behavior reminder' from manager. make: No targets provided near line 28 (CMake), gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast]. That is, nothing will be lost by the missing high 32 bits? * Re: [PATCH] efifb: Fix "cast to pointer from integer of different size" 2011-04-19 20:38 [PATCH] efifb: Fix "cast to pointer from integer of different size" Mike Waychison @ 2011-04 If you are casting, you are probably doing it wrong. I want to calculate the image size in colors in (Mo) and in black and white in (Ko) so for this I'm using a parameters that are past in a terminal command which are (image length and width). Assuming it's the cast of the i variable that causes the problem, first cast it to an integer type that is larger than int and at the same time large enough to hold a pointer. How would you create a standalone widget from this widget tree? Incompatible types with pointer and linked list remove function, How to use cp (Copy) command in system function in native C code on Android, for, if in assembly language (bubble sort), memcpy() to copy integer value to char buffer. Dual EU/US Citizen entered EU on US Passport. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. If it is returning only a 32-bit value, will that always hold the correct value? Anytime you try to assign a 64-bit value in to a 32-bit value without explicitly casting it the compiler will throw a warning [granted, it could still work but in general is not good practice. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. espressif32. Find centralized, trusted content and collaborate around the technologies you use most. i actually name variables zero, first, and so on. int threadnumber CGAC2022 Day 10: Help Santa sort presents! How could my characters be tricked into thinking they are on Mars? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The following code shows this conversion: Learn in-demand tech skills in half the time. I'm not even sure if this is the correct way to go about it. Why my own suid-ed program still holds the original uid? In that case, change func to use the uintptr_t type (defined in stdint.h). an address), and stores it in the character pointer first. Connect and share knowledge within a single location that is structured and easy to search. Here is part of a sketch and on line 142 I get a warning of a cast from integer Should I exit and re-enter EU with my EU passport or is it ok? For a new C user, I would tell them to never cast. Ying-Chun Liu (PaulLiu) Tue, 12 Apr 2011 19:57:16 -0700 Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, cast to pointer from integer of different size [-Wint-to-pointer-cast], warning: cast to pointer from integer of different size [-Wint-to-pointer-cast], assignment makes integer from pointer without a cast [-Wint-conversion], warning: assignment from incompatible pointer type [enabled by default] and cast to pointer from integer of different size [-Wint-to-pointer-cast], Avoid "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] " in a _generic macro, pthread_exit() throws warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] warning. It is defined as follows : Integer type capable of holding a value To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It is designed for treating pointers as integers when necessary. Warning: cast to pointer from integer of different size. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. getting the warning : cast from pointer to integer of different size while cnverting string to integer array and printing unrelated numbers, cast to pointer from integer of different size warning when assigning pointer to function, gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast], pthread_exit() throws warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] warning. This can be silenced by additionally casting func() to a suitable integer type, e.g. Change your code as follows ( assume you are really trying to assign the pointer to the value of line[1] and line[2]). generic programming in C with void pointer. EDIT: To clarify, I don't want 'a' to point to an address that is 4 bytes greater than 'b'. Warnings are issued when the compiler compiles the code and finds something unusual that should be brought to the attention of the programmer. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ", instead of asking, "hmm, I wonder why the compiler is warning me?" My gcc does not give the warning you cited. Was the ZX Spectrum used for number crunching? But using, TabBar and TabView without Scaffold and with fixed Widget. Can we keep alcoholic beverages indefinitely? The compiler issues the cast from integer to pointer of different size warning whenever the value of an integer is converted to a pointer, especially when the memory allocated to a pointer Why is the federal judiciary of the United States divided into circuits? uintptr_t is guaranteed to be wide enough that @JoshPetitt, you're right that I offered the easy solution, not to fundamental one. It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). To learn more, see our tips on writing great answers. How to suppress warning: cast to pointer from integer of different size? 1 - warning: cast from pointer to integer of different size . Find centralized, trusted content and collaborate around the technologies you use most. What are the differences between a pointer variable and a reference variable? In this case, re-examine your expression: is that really the address of a char you're getting? Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? In the first case, the return value from func will lose information, and potentially crash or worse, if int is smaller than the size of a data pointer, which it will be on most 64-bit memory models (including Windows and Linux). Would like to stay longer than 90 days. Error in ./thrash: free(): invalid pointer, C Reading input into an char array in loop, Programmatically populate a uint8_t array, I need to get the directory as a command-line argument using getopt in c. Why is the first value of the array being replaced? i know it's weird. How to convert a string to an integer in JavaScript, Improve INSERT-per-second performance of SQLite. so just remove that & your code will work fine. In the older compilers just doing the char *ptr = (char *)23 was good enough but the new Data is lost upon conversion from a larger number (int) to a smaller number (pointer). Would salt mines, lakes or flats be reasonably found in high, snowy elevations? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Ready to optimize your JavaScript with Rust? Does aliquot matter for final concentration? Originally, that cast was direct, but the intermediate cast to intptr_twas inserted to remove the warning about the cast to pointer from integer of different size. In that case you should change the return type of func to intptr_t; see Using intptr_t instead of void*? When should i use streams vs just accessing the cloud firestore once in flutter? Concentration bounds for martingales with adaptive Gaussian steps. 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