Recent questions tagged C

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c - openmp - while loop for text file reading and using a pipeline

I discovered that openmp doesn't support while loops( or at least doesn't like them too much). And also doesn't ... ? and how to implement 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 - For string, find and replace

Finding some text and replacing it with new text within a C string can be a little trickier than expected. I ... complexity. What should I 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 - Assistance with openssl blowfish simple example inserting garbage characters

If you have a good example of simply encrypting a file using openssl that is better than this one that I am having ... (decfd); 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 - fscanf problem with reading in String

I'm reading in a .txt file. I'm using fscanf to get the data as it is formatted. The line I'm having ... name" with whitespace it doesn't work. 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 - Regarding the bss segment and data segment in Unix

I read in my unix text book that bss is used to store the uninitialized variables(global declarations). This ... from the static variables? 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 - ALSA Api: How to play two wave files simultaneously?

What is the required API configuration/call for playing two independent wavefiles overlapped ? I tried to do so , ... "Device or resource busy" 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 - Need to know how fork works?

I am trying the following C code: int main() { printf("text1 "); fork(); printf("text2 "); return 0 ... , output should be: text1 text2 text2 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 - Geting xml data using xml parser expat

I have managed to parse ok. But now I am having trouble getting the values that I need. I can get the element ... name= 'frame' type= 'int16' 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 - Creating a pcap file

I need to save UDP packets to a file and would like to use the pcap format to reuse the various tools ... insert the header using write()? 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 r() and double percent %% in GCC inline assembly language?

Example: int main(void) { int x = 10, y; asm ("movl %1, %%eax;" "movl %%eax, %0;" :"=r"(y) / ... before eax? Generally single % is used right? 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 - A funny thing with sprintf

I'm so confused with sprintf that a funny problem with different platfrom. Code : int main () { char sql[1024 ... , %I32u", task_id, app_id); 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 - reduction with OpenMP with SSE/AVX

I want to do a reduction on an array using OpenMP and SIMD. I read that a reduction in OpenMP is ... with more complicated operators in OpenMP? 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 - Writing to 0xb8000000 yields output on screen without any print statements such as `printf`

#include <stdio.h> #include <conio.h> void main() { char far *v = (char far*)0xb8000000; clrscr(); ... any printf or other print statements. 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 a char to binary?

is there a simple way to convert a character to its binary representation? Im trying to send a message ... down other methods of communication. 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 - catching SIGINT in a multithreaded program

I am writing a multithreaded program where I want to handle a possible Ctrl-C command from the user to terminate ... the main thread's 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 simulate a low level keypress on os x?

I am trying to generate keyboard keydown and keyup events programmatically. I am currently using ... by ddhidKeyboard:keyDown. 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 - Performance of fwrite and write size

I'm writing out a large numerical 2 dimensional array to a binary file (final size ~75 MB). I'm doing this ... , how big should each chunk be? 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 someone explain redis setbit command?

> setbit mykey 1 1 > setbit mykey 7 1 When I store string value 1 and 7 into "mykey", what was exactly ... . Please feel free to improve 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 unsigned char a[4][5]; a[1][7]; undefined behavior?

One of the examples of undefined behavior from the C standard reads (J.2): - An array subscript is out of range, even ... 7 to a[1] is valid. 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 - SIZE command in UNIX

The following is my C file: int main() { return 36; } It contains only return statement. But if I use the ... this? what is 252 and 8 refers. 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 - Validate max integer in scanf

I want to read a int from stdin but I want to validate if the user exceeds the int max value. How can I do ... How can I check and avoid 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 - In Linux stubs are used for standard libraries. Why are stubs required?

In Linux, why are stubs required for standard 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 - Float32 to Float16

Can someone explain to me how I convert a 32-bit floating point value to a 16-bit floating point value? (s = ... (fltInt32 & 0x80000000) >> 16); 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 - Real-time awareness of timezone change in localtime() vs localtime_r()

Working on an Ubuntu 12.04.3 LTS box, I just noticed that localtime() and localtime_r() behave ... for mentalhealth.stackexchange.com... 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 unsigned int x = -1 and int y = ~0 have the same binary representation?

In the following code segment what will be: the result of function value of x value of y { unsigned int x=-1; ... and int thing - am I right ? 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 a better strlen function?

I am reading "Write Great Code Volume 2" and it shows the following strlen impelementation: int myStrlen( char ... write highly optimized 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 - Multicasting on the loopback device

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done ... ,UDP_PORT); 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 - Efficient implementation of natural logarithm (ln) and exponentiation

I'm looking for implementation of log() and exp() functions provided in C library <math.h>. I'm working ... correct up to 3 decimal places. See Question&Answers more detail:os...

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

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