Recent questions tagged C

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c - Is it possible that a variable declared after the main has file scope?

After running this code: #include <stdio.h> int x; int main(void) { printf("%d ",x); return 0; } int ... accesses 5 for the x in printf? 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 scanf be terminated on pressing some specific key other than enter

I have a situation here i am taking input from user using scanf can I terminate the scanf as soon as user ... key please enlighten me on 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 - Freeing malloced structure in a function

I'm creating a source files containing buffer functionality that I want to use for my other library that I'm ... %d ", buff->total_size); 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 float variable auto-promoted to double type?

I know in C and Java, float's underlying representation is IEEE754-32, double is IEEE754-64. In expressions, ... .7f into IEEE754-64 represent. 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 am I getting a segmentation fault?

I'm trying to write a program that takes in a plaintext file as it's argument and parses through it, adding ... it, I get a segmentation fault. 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 - Fastest sort algorithm for millions of UINT64 RGBZ graphics pixels

I am sorting 10+ million uint64_ts with RGB data from .RAW files and 79% of my C program time is ... Fantastic solution! Thanks Louis Ricci! 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 - Default flags for gcc compiler in Eclipse

I want all my C programs to be compiled with the options -Wall -pedantic -ansi by default. Is there a ... command by default for all projects? 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 - interfacing Python and Torch7(Lua) via shared library

I am trying to pass data (arrays) between python and lua and I want to manipulate the data in lua ... d __TMC_END__ Thanks in 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 - for (unsigned char i = 0; i<=0xff; i++) produces infinite loop

Why does the following c code end up in an infinite loop? for(unsigned char i = 0; i <= 0xff; i++ ... using int or unsigned int datatype)? 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 determine the end of va_arg list?

I have a function foo(char *n, ...); I need to get and use all of optional char parameters. I had ... , without adding NULL as last parameter? 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 can variable field width be implemented with printf()?

The question is : How can variable field width be implemented using printf()? That is, instead of %8d, the width ... text); } 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 - How to use specific link script(*.lds) with CMake?

I'm trying to write a bare-metal program with CMake(my project is locate in https://github.com/oska874/cmake_test ... CMake will use my.lds. 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 - calloc() and NULL

I know that calloc allocates memory and writes zeroes to each cell, so my question is: is there a difference ... of calloc equivalent to 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 - 'Initializer not constant' on global variable?

So I get the 'initializer element not constant' error when compiling the following code: #include <stdlib.h> #include < ... How do I fix 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 - Why the use of "conio.h" is not good habit of programming?

I have attended many online coding competition, they usually mention the note that #include<conio.h> means conio.h ... used. example clrscr(). 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 - realloc invalid old size

Disclaimer: This is homework. I am attempting it and do not expect or want anyone to do it for me. Just a few ... [i] = x; return newSize; } 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 #include directive doesn't have a semi-colon at the end of statement?

In C, semicolons (;) are used to indicate the end of the statement. Why do #include lines not need a semicolon? 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 - pthread_create fails with EAGAIN

Consider this code snippet here, where I am trying to create a bunch of threads which end up processing a given ... as they are at this point. 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 find out if the eth0 mode is static or dhcp?

I want to use a C program to get if the ip of the network interface is set manually or via dhcp. I've ... a program to get the same result. 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 read coprocessor registers in ARM architecture

I'm trying to read CP15 coprocessor in the following System-on-chip Cortex A7 - ARMv7-A Below my snippet void ... What'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 - Unions within unions

In C, is it possible to define a union within another union? If no, why is it not possible? Or if yes, where can it be used? 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 sizeof(x++) not increment x?

Here is the code compiled in dev c++ windows: #include <stdio.h> int main() { int x = 5; printf("%d ... why x does not increment after note 1? 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's the difference between arrays of arrays and multidimensional arrays?

I had a language-agnostic discussion with someone in the C++ chat and he said that arrays of arrays and ... does not fit that definition? 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 - Getting the offset of a variable inside a struct is based on the NULL pointer, but why?

I found a trick on a youtube video explaining how you can get the offset of a struct member by using a NULL pointer ... ", offset); 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 - Rationale of static declaration followed by non-static declaration allowed but not vice versa

This code will compile and is well defined under current C standards: static int foo(int); extern int foo( ... mistakes in future C projects. 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 fwrite non-blocking?

Before calling fflush can I consider fwrite to be = a non-blocking write? If not, why not and what are my alternatives? 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 unsigned int contained negative number

What I know about unsigned numerics (unsigned short, int and longs), that It contains positive numbers only, but the ... of 10 from 20 is -10 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 - technical legality of incompatible pointer assignments

The C11 standard ISO/IEC 9899:2011 (E) states the following constraints for simple assignments in §6.5.16.1/1: ... =c11 instead of -std=gnu11? See Question&Answers more detail:os...

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

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