Recent questions tagged C

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I was trying to learn how to use the "new" C11 Generic expressions but I ran into a wall. Consider ... that should never even compile? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Does pointer arithmetic still work outside the array?

I am always reading that pointer arithmetic is defined as long as you don't leave the bounds of the array. I am not ... not C++). Am I covered? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to use 32-bit pointers in 64-bit application?

Our school's project only allows us to compile the c program into 64-bit application and they test our ... applications? Thanks for the help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How are different types stored in memory

I am currently writing a C program involving dealing with bytes. When it comes to bytes, I'm really confused about ... adding 0 at the front? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Little vs Big Endianess: How to interpret the test

So I'm writing a program to test the endianess of a machine and print it. I understand the difference between ... printf("Big-Endian "); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Logging enums on the pebble watch

When i log an error on the Pebble like this: static void message_dropped(AppMessageResult reason, void ... return "APP_MSG_BUFFER_OVERFLOW" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why do "a+1" and "&a+1" give different results when "a" is an int array?

int main() { int a[]={1,2,3,4,5,6,7,8,9,0}; printf("a = %u , &a = %u ",a,&a); printf("a+ ... 1,&a+1); } how a and &a are internally interpreted? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How is "__builtin_va_list" implemented?

I want to delve into the implementation of function "printf" in C on macOS. "printf" uses the <stdarg.h> ... the source code of clang compiler? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Sleeping for milliseconds on Windows, Linux, Solaris, HP-UX, IBM AIX, Vxworks, Wind River Linux?

I have to write a C program which has to sleep for milliseconds, which has to run on various platforms like ... IBM AIX and Wind River Linux? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - GCC alias to function outside of translation unit -AKA- is this even the right tool for the job?

I'm working with FreeRTOS on an STM32 (Cortex-M3), and using the CMSIS library from ST to bootstrap everything. ... -42) Target: arm-none-eabi See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Regex.h for windows

I'm using Code::Blocks on Windows to write a dll in C. I need to include regex.h. What's the simplest way to get regex.h for win? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Weird use of void

I've been going through some C source code and I noticed the following: void some_func (char *foo, struct bar ... the rationale for such an use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - send struct in mq_send

I am using POSIX IPC and according to the documentation - http://man7.org/linux/man-pages/man3/mq_send.3.html ... to accomplish this in C lang? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How avoid using global variable when using nftw

I want to use nftw to traverse a directory structure in C. However, given what I want to do, I don't see a ... I post this as a follow-up. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Requirements for behavior of pointer-to-volatile pointing to non-volatile object

C11 6.7.3 Type qualifiers, paragraph 7, reads: An object that has volatile-qualified type may be modified in ... need to be volatile int. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What is “standard input”?

I was tasked with creating a test program in C that reads the contents of the standard input and then prints them. ... it the console? a file? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Error: initializer element is not computable at load time

I have a function that takes a struct, and I'm trying to store its variables in array: int detect_prm(Param prm) ... fine to me, what's wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why does GLib redefine types?

What is the reasoning behind types to be redefined in GLib? Why do they turn char into gchar, int into gint, etc.? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to write or read memory without touching cache

Is there any way to write/read memory without touching L1/L2/L3 cache under x86 CPUs? And is cache in ... of memory's performance degrades. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why are the results of integer promotion different?

Please look at my test code: #include <stdlib.h> #include <stdio.h> #define PRINT_COMPARE_RESULT(a, b) if ... second case of integer promotion. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - struct sigaction incomplete error

Although including <signal.h> I get an error saying that struct sigaction is an incomplete type. I have ... declaration of function sigaction' See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - is it good or bad to reuse the variables?

I wonder if it is good or bad (or does not matter) if I reuse the variable names as much as possible? ... size, performance, or anything else? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Initialize values of array in a struct

I have a struct which has several arrays within it. The arrays have type unsigned char[4]. I can initialize ... the values to the struct array. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Efficient computation of 2**64 / divisor via fast floating-point reciprocal

I am currently looking into ways of using the fast single-precision floating-point reciprocal capability of various modern ... ); return res; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - chdir() to home directory

I am using the chdir() C function to allow a user to change directory. The function however, doesn't recognize ... am I doing something wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Socket programing Permission denied

Following code is TCP server program just send back HELLO!! to client. When I run server with port 80, bind() ... ; close(sock); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to stop GDB from executing "break main" by default in Eclipse?

I'm working on a C project with Eclipse and MinGW. When running a debug build of this project, gdb always ... main by default within Eclipse? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to update other pointers when realloc moves the memory block?

The realloc reference says: The function may move the memory block to a new location, in which case the ... prevent cptr from becoming invalid? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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