Recent questions tagged C

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c - Is there a GCC keyword to allow structure-reordering?

I know why GCC doesn't re-order members of a structure by default, but I seldom write code that ... structures to be automaticly reordered? 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 - Implementation of nested functions

I recently found out that gcc allows the definition of nested function. In my opinion, this is a cool feature, ... it at the same time. 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 - Vulkan: What is the point of sType in vk*CreateInfo structs?

In all of the create info structs (vk*CreateInfo) in the new Vulkan API, there is ALWAYS a .sType member. ... structs have the .sType member? 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 reason function names are prefixed with an underscore by the compiler?

When I see the assembly code of a C app, like this: emacs hello.c clang -S -O hello.c -o hello. ... xorl %eax, %eax popq %rbp ret Leh_func_end0: 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 - Malloc vs custom allocator: Malloc has a lot of overhead. Why?

I have an image compression application that now has two different versions of memory allocation systems. In ... this overhead inside malloc? 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 - Implementing a FIFO mutex in pthreads

I'm trying to implement a binary tree supporting concurrent insertions (which could occur even between nodes) ... priorities accomplish this? 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 - Portable data reinterpretation

I want to reinterpret data of one type as another type in a portable way (C99). I am not talking about ... reinterpret data in a portable way? 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 - Yet Another MinGW "gcc: error: CreateProcess: No such file or directory"

I have installed MinGW C compiler in Windows 8 (64 bit) through the GUI installer. But when I try to ... : No such file or directory 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 - `bash: ./a.out: No such file or directory` on running executable produced by `ld`

Here is a Hello World code in C: // a.c #include <stdio.h> int main() { printf("Hello world "); ... a.c produces a.out which runs correctly. 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 am I able to perform floating point operations inside a Linux kernel module?

I'm running on an x86 CentOS 6.3 (kernel v2.6.32) system. I compiled the following function into a bare- ... because I'm on an x86 processor? 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 - Linking with gcc and -lm doesn't define ceil() on Ubuntu

I am currently using gcc to compile and I need to use <math.h>. Problem is that it won't recognize the library. I ... was: gcc -lm -o fb file.c 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 this implementation of strlen() work?

(Disclaimer: I've seen this question, and I am not re-asking it -- I am interested in why the code works, ... and we are reading past its end. 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 was mixing declarations and code forbidden up until C99?

I have recently become a teaching assistant for a university course which primarily teaches C. The course standardized ... no purpose at all. 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 - Trouble reading a line using fscanf()

I'm trying to read a line using the following code: while(fscanf(f, "%[^ ]s", cLine) != EOF ) { /* ... I fix to make it work as expected? 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 - Determining Stack Space with Visual Studio

I'm programming in C in Visual Studio 2005. I have a multi-threaded program, but that's not especially important ... the answer on a regular PC. 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 - convert an integer number into an array

I am trying to convert an integer number in C into an array containing each of that number's digits i ... ; Any suggestions gratefully received. 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 - Redeclaration of global variable vs local variable

When I compile the code below #include<stdio.h> int main() { int a; int a = 10; printf("a is %d ",a) ... that for a local variable is an 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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400 views

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c - using scanf function with pointers to character

I have written the following piece of code. int main(){ char arrays[12]; char *pointers; scanf("%s",arrays); ... I write `scanf("%s",pointers)? 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 from Bubblesort program with MSVC vs TCC

One of my friends sent this code to me, saying it doesn't work as expected: #include<stdio.h> void ... the variable name makes a difference. 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 - Enabling strict floating point mode in GCC

I haven't yet created a program to see whether GCC will need it passed, When I do I'd like to ... results between runs and computers, 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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218 views

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c - Mis-aligned pointers on x86

Can someone provide an example were casting a pointer from one type to another fails due to mis-alignment? In ... mentioned failures on x86... See Question&Answers more detail:os...

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

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439 views

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c - on iOS/iPhone: "Too many open files": need to list open files (like lsof)

We've discovered our complex iPhone app (ObjC, C++, JavaScript/WebKit) is leaking file descriptors under ... something lsof-esque. 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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536 views

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c - How to use execvp()

The user will read a line and i will retain the first word as a command for execvp. Lets say he will type "cat ... }///end While return 0; } 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 - Execution of printf() and Segmentation Fault

#include<stdio.h> int main() { char *name = "Vikram"; printf("%s",name); name[1]='s'; printf("%s",name) ... ) of line number 6 is not executed ? 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 initialize a structure with flexible array member

I have the following structure typedef struct _person { int age; char sex; char name[]; }person; I have done ... union specifiers - point #17?! See Question&Answers more detail:os...

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

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254 views

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c - Is `*((*(&array + 1)) - 1)` safe to use to get the last element of an automatic array?

Suppose I want to get the last element of an automatic array whose size is unknown. I know that I can make use of the ... + 1)) - 1)); etc 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's a modern term for "array/pointer equivalence"?

Just about everyone reading this is probably familiar with these three key facts about C: When you mention the name ... this FAQ list entry.) 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 add hex escapes into a string-literal?

When you have string in C, you can add direct hex code inside. char str[] = "abcde"; // 'a', 'b', ' ... it is larger than ASCII table can hold. See Question&Answers more detail:os...

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

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