Recent questions tagged C

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gcc 4.6.2 c89 Is there any standard regex expression that can be used to extract the IP address from a ... ; Many thanks for any suggestions, 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 a good way to alter execution order of child processes created with fork()?

I am looking for creating child processes for which I can control their order of processing. Simple example: Parent ... but it's not pretty 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 to find select() source code in glibc source?

i am trying to find the select() source code (linux, i386 arch) in the glibc source code, but i cannot find ... to the select() source 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 - multi-threaded file transfer with socket

I am trying to make a multi-threaded server-client file transfer system in C. There are clients which will ... ); exit(EXIT_SUCCESS); } 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 - Problems with scanf

#include <stdio.h> int main() { char C, B; int x; printf("What comes after G "); scanf("%c", &C); ... and %c Can you please explain this to 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 - How to convert an IEEE 754 single-precision binary floating-point to decimal?

I am working on a program that needs to convert a 32-bit number into a decimal number. The number that I get ... binary. I have to use formula. 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 - Unexpected output when executing left-shift by 32 bits

When I do a left shift of a hex I get -1 as output with the following code: unsigned int i,j=0; ... . Can someone explain the results above? 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 - In Visual Studio Code, is there a way to see the explorer on the left and the outline on the right?

I am used to program having the file browser on the left of the code and the outline on the right. However, ... comes from eclipse)? Thanks, DMR 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 - executing commands via sockets with popen()

Can anybody give me a hand trying to implement the following server and client?: The server: #include <stdlib ... solutions for 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 - comparing off_t and ssize_t with other types

I am new to C and recently ran into some trouble with mismatching data types and their memory allocation. I am writing a ... +) { // do stuff } 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 memory allocated for an implicitly defined multidimensional array in C99?

I'm trying to write a C99 program and I have an array of strings implicitly defined as such: char *stuff[] = ... holds an array of 9 elements)? 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 floating-points number's significant numbers is 7 or 6

I see this in Wikipedia log 224 = 7.22. I have no idea why we should calculate 2^24 and why we should ... ...I really really need your 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 - Is modifying a string pointed to by a pointer valid?

Here's a simple example of a program that concatenates two strings. #include <stdio.h> void strcat(char ... not considered as modifying? 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't read from linux character device

I am implementing an SPI driver for an accelerometer. The SPI part is done but I can't read values from ... closed What am I doing 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 - Isn't there a syntax error? Should printf("one" ", two and " "%s. ", "three" ); be valid code?

Take a look at this code: #include <stdio.h> #define _ONE "one" #define _TWO_AND ", two and " int main() { const ... that way, or is it a bug? 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 do computations with addresses at compile/linking time?

I wrote some code for initializing the IDT, which stores 32-bit addresses in two non-adjacent 16-bit ... linking time is actually infeasible. 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 - Synchronising N sibling processes after fork

I'm having some hard time with synchronising N child process waiting each one of them to arrive at some specific point ... of stuff... 10 times 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 - Preprocessor concatenation for include path

I have a set of includes that reside in a far off directory meaning that including them requires a long ... pre-processor suitable for this? 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 - Share a file descriptor between parent and child after fork and exec

I have two processes on Linux, A & B. I want to share the file descriptor from process A with ... @OliCharlesworth. Please close this question. 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 test input is sane

Consider the following simple C program. //C test #include<stdio.h> int main() { int a, b, c; printf(" ... fgets and sscanf or even strtol ? 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 - strange behavior of scanf for short int

the code is as follows: #include <stdio.h> main() { int m=123; int n = 1234; short int a; a=~0; if((a ... affect the value of m ? Thanks a lot ! 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 - Determine Original Exit Status Code

In a software baseline I am maintaining, there are 150 statements spread out amongst various C applications ... application which returned 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 - How to get scanf to continue with empty scanset

I am currently trying to parse UnicodeData.txt with this format: ftp://ftp.unicode.org/Public/3.0-Update/UnicodeData ... making my own scanf()? 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 coding practice to assign the address returned by realloc() to the same pointer?

I saw some code related to realloc() on some sites as below. int *p = (int *)malloc(sizeof(int) * 10); ... by realloc() to the same pointer? 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 happens if I use malloc with the wrong size?

I'm trying to learn more about memory allocation, and so I wrote some test code below to see what would ... contexts (suppressed: 2 from 2) 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 - Linux Pipes as Input and Output

I would like to do the following inside a C program on a Linux os: Create a PIPE using a syscall (or 2 ... doing this for both input and output? 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 - method for expand a-z to abc...xyz form

Hi:) what i'm trying to do is write a simple program to expand from shortest entry for example a-z or 0-9 ... (2) 01234 Thanks for 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 - Any function to query the size of an allocated block?

I realize that any such function is likely to be non standard, but that's ok for my use case. Basically, I ... at. Does such a thing exist? See Question&Answers more detail:os...

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

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