Recent questions tagged C

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c - Getting keyboard modifiers state using Gnome libs (GDK) fetches initial state only

I'm trying to get the current keyboard modifiers state through gnome GDK or GTK library in aim to implement an ... 's wrong with my 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 - how to assign a value to a string array?

for example #include <stdio.h> #include <stdlib.h> #include <string.h> char substr[10][20]; int main() { substr ... wrong? how to do it? thanks 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 - Bit shifting a byte by more than 8 bit

In here When converting from bytes buffer back to unsigned long int: unsigned long int anotherLongInt; anotherLongInt = ... see how that works. 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 legal to type-cast pointers of different struct types (e.g. struct sockaddr * to struct sockaddr_in6 *)?

Here is a program that type-casts between pointers of type struct shape, struct rectangle and struct triangle. ... .out IPv6 port: 20480 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 : Static array index in function argument doesn't trigger any warning

I'm trying to understand the use of the "static" keyword as an array index in a function declaration in C. ... for GCC to omit this warning? 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 - Can looking at freed memory cause an access violation?

Can accessing (for read only) memory freed cause an access violation, and, if so, under what circumstances? 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 comparing to a pointer one element past the end of an array well-defined?

I learned by this question that incrementing a NULL pointer or incrementing past the end of an array isn't ... Is this well-defined behavior? 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 - Can fseek(stdin,1,SEEK_SET) or rewind(stdin) be used to flush the input buffer instead of non-portable fflush(stdin)?

Since I discovered fflush(stdin) is not a portable way to deal with the familiar problem of "newline lurking in the ... by ftell() in that case. 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 %lld on Windows

Why does this code: #include <stdio.h> int main(int argc, char** argv) { printf("%lld ", 4294967296LL); } ... : 0 but this for Linux: 4294967296 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 - function call with different semantics

Considering this code with 3 differents function call semantics: void f(void){ puts("OK"); } int main(void){ ... and third case happen? Thanks. 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 non-blocking I/O is turned on for stdout, is it correct for the OS to turn it on for stdin too?

I have noticed some unexpected behaviour on both OS X and Linux. Turning on non-blocking I/O (using ... 2048 stdin O_NONBLOCK is: 2048 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 - Can the floating-point status flag FE_UNDERFLOW set when the result is not sub-normal?

While investigating floating-point exception status flags, I came across the curious case of a status flag FE_UNDERFLOW set when ... ; // ^^^^^ 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 - Avoiding TIME_WAIT

I'm trying to avoid TIME_WAIT in a client. I connect and then set O_NONBLOCK and SO_REUSEADDR. I call read ... the file descriptor be released? 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 - OSX FSEventStreamEventFlags not working correctly

I am watching a directory for file system events. Everything seems to work fine with one exception. When I create a ... (stream); 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 - Are empty arrays no longer allowed by gcc?

I have gcc 4.7.2-3 and I get this following error: main.c:5:6: error: array size ... /base_doc/DOCUMENTATION/V40F_HTML/AQTLTBTE/DOCU_046.HTM 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 - Calculate the histogram with OpenMP

I want to parallelize this code getting the best performance. "histogram" stores number of appareances of a ... Any suggestions? Thank you. 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 - using qsort to sort two arrays simultaneously?

I can sort a array of pointers to words so that they are ordered alphabetically, the problem is that I need to ALSO ... (char * const *)p2); } 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 run pthreads on windows

I used to use a mac to write some c programs but its not working now.. I have to use an old windows ... writing these sort of programs? Thanks 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 - Where in the C99 standard does it say that signed integer overflow is undefined behavior?

Where in the C99 standard does it say that signed integer overflow is undefined behavior? I see the comment ... , not integer arithmetic itself 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 limit the input of scanf to integers and floats (numbers in general)

I am curently learning C Programming in University and I got the task to write a program witch puts out the ... or at least any solution. 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 - Function that takes a char array and 2 indices; swapping the chars in those indices

This is my function prototype: char* swap(char* array, int index1, int index2); This is my assembly code: segment .text ... : E L A M P X E 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 - Check if pointer points to given array

So I have a function that returns a pointer to an element in an array A. I have another function that takes that ... C++, but not with C. 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 - function with rand initializes matrix always the same way

I have a function that should initialize the values of matrix in a random way, given a probability (in this ... I using it incorrectly? Thanks! 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 fgets() always null-terminate the string it returns?

Is this safe to do? Does fgets terminate the buffer with null or should I be setting the 20th byte to null ... free(buffer); return NULL; } 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 - Pointer to a function - A different approach of declaring

While reading this (the answer given by psychotic), I understood how to typedef and call a function pointer. ... yield the same functionality. 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 is my program only printing to 6 decimal places?

Ive created a program to compute the value of an integral from zero to infinity, however when i go to print my answer ... ", sum); 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 - Why does printf output not appear right away when stepping through the code?

I'm using Anjuta and gdb on Fedora 20 and created a C Makefile project. The code looks like this: #include < ... breakpoint 2 to the 3rd one. 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 - Sender IP/Port for UDP Socket

Is it possible to obtain the sender IP and (dynamically obtained) port with C sockets? I have the following: ... help is appreciated, thanks! See Question&Answers more detail:os...

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

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