Recent questions tagged C

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Why is not 12 in the first case? Tested on: latest versions of gcc and clang, 64bit Linux struct desc { int** ... ; }; sizeof(desc); Output: 4 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 - Memory order consume usage in C11

I read about the carries a dependency relation and dependency-ordered before that uses one in its definition 5.1.2 ... causing any data race... 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 can't I increment an array?

char a[] = "hello"; My understanding is that a acts like a constant pointer to a string. I know writing a++ won't work, but why? 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 is 248x248 the maximum bi dimensional array size I can declare?

I have a program problem for which I would like to declare a 256x256 array in C. Unfortunately, I each time I ... how to check GCC version). 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 - Correct use of Realloc

This is the way I've been taught to use realloc(): int *a = malloc(10); a = realloc(a, 100) ... been reallocated and has now 100 elements 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 - CMake cross-compile with specific linker doesn't pass arguments to armlink

I am trying to cross-compile a project for embedded ARM Cortex builds, but I am unable to get the linker working. ... /blinky.c.o -o blinky.elf 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 restart stdin after Ctrl+D?

Running a program expecting input from terminal I can ”close” stdin by Ctrl+D. Is there any way to reopen stdin after that? 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 are expressions with side effects and why should they be not passed to a macro?

I came across a statement in the text C How to Program: "Expressions with side effects (i.e., variable values are ... be not passed to a macro? 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 and how does GCC compile a function with a missing return statement?

#include <stdio.h> char toUpper(char); int main(void) { char ch, ch2; printf("lowercase input : "); ch = ... answer in this case. 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 - strdup() function

I recently became aware that the strdup() function I've enjoyed using so much on OS X is not part of ANSI C, ... , which is just a bit tedious? 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 - Is scanf("%d%d", &x, &x) well defined?

Is the following code well defined? #include <stdio.h> int ScanFirstOrSecond(const char *s, int *dest) { return sscanf(s ... . C11dr §7.21.6.2 4 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 do the suppressed leaks mean in Valgrind?

I have developed a pure-C implementation of FIFO lists (queues) in files fifo.h and fifo.c, and ... any easily understandable new information. 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 - forwarding (drawing) line in 3d grid

I need something like Bresenham algorithm but not quite and for 3d grid-space. I got 3d grid of cells (edge size ... say how it could look like? 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 - copying the contents of a binary file

I am designing an image decoder and as a first step I tried to just copy the using c. i.e open the file, ... Do you know what the problem is? 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 - MPI_Scatter - sending columns of 2D array

I want to send 2D array's columns, each to separate process. I have now one whole 2d array and I am stuck ... data, which are sent by scatter? 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 is strtok causing a segmentation fault?

Why does the below code give Seg. Fault at last line? char* m=ReadName(); printf(" Read String %s ",m); ... , but why cannot split to tokens? 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 - Use a dope vector to access arbitrary axial slices of a multidimensional array?

I'm building a suite of functions to work with a multidimensional-array data structure and I want to be able ... array which has some details.) 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 printf print wrong values?

Why do I get the wrong values when I print an int using printf("%f ", myNumber)? I don't understand why it ... d, e); //prints weird stuff 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 - Can Mac OS X El Capitan run software compiled for Yosemite that expects libraries in /usr/gnu64/lib?

Sorry, there's a bit of background necessary - you could try skipping to the Question heading. Since time ... it will fix that problem. 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 preprocessor - How can I implement a dynamic dispatch table in C

First of all, I understand how to implement a dispatch table using function pointers and a string or other ... firstStrategy ); Any thoughts ? 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 scanf and fgets in the same program?

I need to do something like the following: int main(void) { char a,b,cstring; printf("please enter something") ... How do I do multiple inputs? 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 properly compare command-line arguments?

I am trying to write a C code which takes arguments in main; thus when I write some strings in cmd, the program ... "OMG!!" Which part is wrong? 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 - When does appending an 'f' change the value of a floating constant when assigned to a `float`?

Applying an f to a floating point constant does not seem to make a difference when assigning the constant to ... Why ever use 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 - How to know on which physical processor and on which physical core my code is running

How can I know in a C program, on which physical processor and core my code is running? I'm using Linux and gcc 4.4.3. 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 - Check if a value from scanf is a number?

In the simplest way possible, how can I check if an integer initialized from function scanf is a number? 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 - Statically link ncurses to program

I'm having some problems statically linking ncurses to one of my programs Here's a really simple sample program: ... What am I missing here? 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 - Swapping objects using pointers

I'm trying to swap objects for a homework problem that uses void pointers to swap objects. The declaration of ... two above methods??? 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 to create static linked shared libraries

For my master's thesis i'm trying to adapt a shared library approach for an ARM Cortex-M3 embedded system. As ... be refused by the linker.) See Question&Answers more detail:os...

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

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