Recent questions tagged C

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c - Finding out the duplicate element in an array

There is an array of size n and the elements contained in the array are between 1 and n-1 such that each element ... XOR method works in O(n)? 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 - The difference between stdout and STDOUT_FILENO

I was wondering the difference between stdout and STDOUT_FILENO in Linux C. After some searching work, I draw ... is appreciated, thanks. 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 - Where to find the complete definition of off_t type?

I am sending file from client to server using TCP. To mark the end of the file I like to send file ... # endif # define __off_t_defined #endif 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 - Raw H264 frames in mpegts container using libavcodec

I would really appreciate some help with the following issue: I have a gadget with a camera, producing H264 compressed ... do it? Thanks, f. 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 does NSError need double indirection? (pointer to a pointer)

This concept seems to trouble me. Why does an NSError object need its pointer passed to a method that is modifying ... error:(NSError **)error? 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 is the difference between static const and const?

What is the difference between static const and const? For example: static const int a=5; const int i=5; Is ... you use one over the other? 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 - Using Cython To Link Python To A Shared Library

I am trying to integrate a third party library written in C with my python application using Cython. I ... using Cython and disutils? Thanks 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 - Using printf with a non-null terminated string

Suppose you have a string which is NOT null terminated and you know its exact size, so how can you print that ... can not find out now... 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 - Very fast memcpy for image processing?

I am doing image processing in C that requires copying large chunks of data around memory - the source and ... you the explanation :)) 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 is the difference between signed and unsigned int

What is the difference between signed and unsigned int? 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 use bzero over memset?

In a Systems Programming class I took this previous semester, we had to implement a basic client/server in ... option for newer programs? 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 - printf() formatting for hexadecimal

Why, when printing a number in hexadecimal as an 8 digit number with leading zeros, does %#08X not display the same ... 't work with just 8. 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 is the difference between AF_INET and PF_INET in socket programming?

What is the difference between AF_INET and PF_INET in socket programming? I'm confused between using AF_INET and ... address in sin_addr field? 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 - socket connect() vs bind()

Both connect() and bind() system calls 'associate' the socket file descriptor to an address (typically an ip/port ... not fully clear to me. 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 in btree implementation

Can anyone please help in removing this segmentation fault. I am working on this code for a week still unable to debug this. This code is a ... [i]; p[i] = p[i+1]; } return --p...

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

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c - float to int unexpected behaviour

can you please explain the o/p behavior of this program. int main() { float a = 12.5; printf("%d ", a ... /AQRlAzkC why is this output coming .. 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 FILE * does not store the address of an open file

#include <stdio.h> FILE * Openfile(char *filename,char *mode, FILE *fp); int main(){ FILE *fp=NULL; char ... function? Why need back for save? 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 - printf with "%d" of numbers starting with 0 (ex "0102") giving unexpected answer (ex '"66")

I used below code in my printf statement. void main() { int n=0102; printf("%d", n); } This prints ... regarding how this conversion is done??? 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 Run a thread right after it's creation

I have a C program in which I use pthread. I would like newly created threads to run as soon as they are ... Linux 3.6 on x86_64. Thanks 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 are extremely large floating-point numbers represented in memory?

How do arbitrary-precision libraries like GMP store extremely large floating-point numbers represented in memory? I would ... this how it works? 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 - My floating point number has extra digits when I print it

I define a floating point number as float transparency = 0.85f; And in the next line, I pass it to a function ... I make sure it is not changed? 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 - Using getchar() in a while loop

#include <stdio.h> main() { int c ; while ((c = getchar()) != EOF) { int isEOF = (c==EOF); printf( ... EOF: 0 The same happens on every input. 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 - Sizeof arrays and pointers

Here is my sample code #include<stdio.h> void main() { int arr[]={1,2,3,4,5,6}; char *ptr,a; a='c' ... and it should be having size =4 ? Thanks. 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 - Unexpected output of printf

int a=5; float b=3.5; printf("%d",b); printf(" %f",a); Can anyone please tell me why this code is showing unexpected output (garbage 3.5) 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 - Algorithm to pick values from array that sum closest to a target value?

I have an array of nearly sorted values 28 elements long. I need to find the set of values that sums to a ... that create the next Lowest Sum. 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 print the name of the symbols of ELF files like the nm?

I know the name of the symbols are in the shstrtab. But I don't get how to catch them. Should I cast my ... , &str[shstrtab[i].sh_name]); } 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 kind of C11 data type is an array according to the AMD64 ABI

I was researching the calling convention of x86_64 that's used on OSX and was reading the section called " ... be treated as a pointer? 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 - fd leak, custom Shell

I'm working on a custom shell that can handle multiple pipes. But every time I execute a new pipeline ... , NULL}; execute_pipeline(pipeline); See Question&Answers more detail:os...

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

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