Recent questions tagged c

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c - how to use #ifdef with an OR condition?

Sorry for asking very basic question. I would like to set OR condition in #ifdef directive.? How to do that ? ... work? What is the proper way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What does posix_memalign/memalign do

I'm trying to understand what functions memalign() and posix_memalign() do. Reading the available documentation ... (low-fragmentation heap). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linux shared memory: shmget() vs mmap()?

In this thread the OP is suggested to use mmap() instead of shmget() to get shared memory in Linux. I visited ... method or mmap()? And why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - how to make a process daemon

I am trying to understand how can I make my program a daemon.So some things which I came across are In ... this process in more depth. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - pthread_cond_wait versus semaphore

What are the pros / cons of using pthread_cond_wait or using a semaphore ? I am waiting for a state change like ... and cons of each method ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to compile executable for Windows with GCC with Linux Subsystem?

Windows 10 Anniversary Update includes the Linux Subsystem for Ubuntu. I installed gcc with sudo apt-get install ... GCC in Linux Subsystem ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What does the constant 0.0039215689 represent?

I keep seeing this constant pop up in various graphics header files 0.0039215689 It seems to have something to ... on Google that explained it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - UNIX nonblocking I/O: O_NONBLOCK vs. FIONBIO

In every example and discussion I run across in the context of BSD socket programming, it seems that the ... of individual ioctl methods. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How do I set a conditional breakpoint in gdb, when char* x points to a string whose value equals "hello"?

Can I specify that I want gdb to break at line x when char* x points to a string whose value equals "hello"? If yes, how? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Difference between dangling pointer and memory leak

I don't understand the difference between a dangling pointer and a memory leak. How are these two terms related? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - DESTDIR and PREFIX of make

I am trying to make software install to a specific directory. I found several ways, but not sure what are the ... Do they achieve the same goal? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - GDB With a coredump file in linux

I just got a core-dump file in linux with ulimit -c unlimited how can I attach gdb with it I need to give ... Help me to get into gdb Cheers!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to access a structures' members outside of its original function?

I am working on a project where I am creating structures inside of a separate function than main(). After being ... ; } } return carptr; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why are the int and float passed in printf going to the wrong positions in the format string?

printf function int to %f , float to %d trying to experiment #include<stdio.h> int main(){ int i=10 ... why these variables are interchanging ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Pointer losing its value + execv compilation warning

I hope I haven't missed a similar question. I'm trying to code a mini-shell of my own, using primitive C ... What should I do to avoid this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Undesired output with modulo operator and ' pow '

for the below shown code #include<stdio.h> #include<math.h> int main() { int a,i,n=0; int temp=0; scanf(" ... 23. Only the output by gcc has 24 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - malloc() seg fault in localtime()?

Here's ny stack malloc() at 0xb7dfd333 strdup() at 0xb7e01866 tzset_internal() at 0xb7e2ef68 __tz_convert() at ... shown above. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Program didn't crash when buffer overflow

I want to read a string from keyboard and store in buf . I set a char buf[6] array , this array at most can ... buf)); printf("%s ",buf); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Segmentation fault using strcat

Here is my code : char *name, name_log="log-"; ------getting 'name' from user----- strcat(name_log, name); ... wrong and how can I fix it ? Thx See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Can someone explain how pointer to pointer works?

I don't really understand how the pointer to pointer works. Any way to do the same work without using pointer to pointer ... &(*tmp)->money); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Setting alias for GCC in Windows PowerShell

I'm trying to set up a "gcc99" alias in Windows PowerShell which is equal to "gcc -std=C99 -pedantic -Wall". The ... 1: link" on the next line.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Stack pointer difference for char pointer and array

I have a char array as below: char buffer[100] And another char pointer as below: char *buffer buffer = ... they are actually different. Why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How #define work? Strange result for CUBE(y) y*(y*y)

#include<stdio.h> #include<conio.h> #define CUBE(y)y*(y*y) main() { int j; j = CUBE(-2+4); printf(" ... this step by step, means in easy way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - error: extern declaration of 'i' follows declaration with no linkage

In the following program, I thought that extern int i; will change the following i to refer to the i ... that? Thank you for explanations! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is this assembly function call safe/complete?

I don't have experience in assembly, but this is what I've been working on. I would like input if I'm missing any ... (d), "a"(foo) ); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - to find if a given string is palindrome or is not palindrome

I made a program to find if a entered string is palindrome or not palindrome but it always says that its not a ... Palindrome."); getch(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to use C11 standard in Code::Blocks

Like the Title says I need to make code::blocks to work with C11 and I can't figure out how to do it. I ... make code::blocks to work with c11 ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Compiler warning for function defined without prototype in scope?

[Question inspired by a comment thread at this answer.] As everyone knows, since C99 it's an error to call ... again, would defeat the purpose.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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