Recent questions tagged C

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While running this code, I encounter Segmentation fault at scanf(). This is possibly due to the declaration of ... me how correctify this code. 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 - problem with printf function?

i wrote the following program #include <stdio.h> main() { int i = 2; float c = 4.5; printf("%d ",c ... whats happening ,any one pls explain me. 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 - When to use include guards?

I know that the use of include guards in header files is to prevent something from being defined twice. Using this ... . Why is there no error? 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 do I dynamically allocate a 2d array of chars?

I want to dynamically allocate a 2d array to store strings. I originally declared the array like this: char ... it to prevent stack 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 - Fast float quantize, scaled by precision?

Since float precision reduces for larger values, in some cases it may be useful to quantize the value based ... their magnitude into account? 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 ensures reads/writes of operands occurs at desired timed with extended ASM?

According to GCC's Extended ASM and Assembler Template, to keep instructions consecutive, they must be in the same ... ) before the POP %EBX? 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 - Analyzing memory mapping of a process with pmap. [stack]

I'm trying to understand how stack works in Linux. I read AMD64 ABI sections about stack and process initialization and it ... 0 rw--- [ anon ] 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 - wait for children and grand-children

How can you wait until all children and grand-children have exited, without blocking in a signal handler? This is my ... ; printf("ciao "); } 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 - Webkit GTK :: How to detect when a download has finished?

I was wondering if there is a way to know when a webkitdownload has finished without error. I am using the ... until it has finished? Cheers 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 - access element of struct passed into a void* pointer

I'm working with a binary search tree data structure to sort a series of structs with the type definitions: ... seem to pass the 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 - Is there was a mechanism in Windows works like message queue in Linux?

Recently, I got a job(C/C++) to use message communication between different threads in Windows. I Googled and ... ) in Windows works like that? 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 - getting mouseclick coordinates with Xlib

I would like to know how to get the x and y coordinates of a mouseclick with Xlib anywhere on the screen. I've ... C, I am happy to hear it. 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 right to simply include all header files?

Remembering the names of system header files is a pain... Is there a way to include all existing header files at ... Why doesn't anyone do that? 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 - When using ld to link, undefined reference to '__main'

/* test.c */ void func1() { } int main() { func1(); } Hello, I am making kernel code using C. But I ... should I do to solve this problem.. ? 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 - Implementing single-precision division as double-precision multiplication

Question For a C99 compiler implementing exact IEEE 754 arithmetic, do values of f, divisor of type float exist ... , before it has finished? See Question&Answers more detail:os...

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

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793 views

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c - Conversion between float and int, byte representation?

I have a question which deals with the difference in representation between a float and a byte in a computer ... would be very helpful! See Question&Answers more detail:os...

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

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607 views

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c - How to write a short block of inline gnu extended assembly to swap the values of two integer variables?

For entertainment, I am learning gnu extended assembly using AT&T syntax for x86 with a 32bit Linux target. I have just spent ... a is 1, b is 1 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 - strtok program crashing

the program for strtok given on http://www.opengroup.org/onlinepubs/000095399/functions/strtok.html crashes everytime ... works. Kindly explain. 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 does linker resolves duplicate symbols in dynamically loadable libraries?

I have two dynamically loadable libraries lib_smtp.so and and libpop.so etc. Both have a global variable ... for statically linked libraries. 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 - LD_LIBRARY_PATH

Can I set LD_LIBRARY_PATH for an individual application? I am looking into system call failure, so is ... using the LD_LIBRARY_PATH setting? See Question&Answers more detail:os...

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

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626 views

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c - Difference between putting variables in header vs putting variables in source

Say I declare a header file with a variable: int count; Then in the source file, I want to use count. Do I ... file? Or does it not matter? 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 compiler in Cygwin output .exe

Just starting in C, and learning the basics. I have created a simple program that when compiled, would expected to ... is compiling as a.exe. 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 do you detect the CPU architecture type during run-time with GCC and inline asm?

I need to find the architecture type of a CPU. I do not have access to /proc/cpuinfo, as the machine is running ... { return 1; } 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 - Weird compilation error in Visual Studio 2008

I have a problem compiling the following code: #include <stdio.h> #include <limits.h> int main () { printf(" ... Any idea what the issue is? 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 - Incrementing the value of POSIX semaphores by more than 1

I have this requirement wherein I have to increment the value of a POSIX semaphore by more than 1. Apparently, ... . Great thanks in advance. 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 - Clarification on integer constant expressions

Somewhere I've read that integer constant expressions consists integer constants such as: (5 + 5) //integer constant ... (int)(5/3.14f); 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 GCC give a warning when setting an unsigned long to 2^64-1?

The C standard states that a long int is at least 4 bytes - on my system it is 8 bytes. This means ... - when I declared it explicitly? 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 do I stop sem_open() failing with ENOSYS?

I have two Slackware Linux systems on which the POSIX semaphore sem_open() call fails with errno set to 38. ... ; sem_unlink(SEM_NAME); } } See Question&Answers more detail:os...

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

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