Recent questions tagged C

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I am trying to learn the libuv api and wrote the following test: #include <stdio.h> #include <stdlib.h> ... do I need tomanually flush 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 - ARM: Is writing/reading from int atomic?

On ARM architecture, unfortunately I don't know exactly what chip it is, is a 32 bit int read/write atomic ... reads/writes to basic types? 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 - Using scanf in a while loop

Probably an extremely simple answer to this extremely simple question: I'm reading "C Primer Plus" by Pratta ... is this totally superfluous? 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 - Access violation when using strcpy?

I've tried reinventing the strcpy C function, but when I try to run it I get this error: Unhandled exception at ... ; getchar(); 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 - Mixed static and dynamic link on Mac OS

I want to use gcc to produce a shared library, but i want to link some other libraries it depends on ... to create the dynamic object? 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 - when to carefully use free() to free up malloc() used memory?

I read from many question here in SO and some other articles regarding free() function in c that frees the memory ... free(strC) ? advice pls. 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 does "*((char*)-1) = 'x';" code mean?

I had a problem in reading redis source code, can anyone tell me what is the use of the last statement in the _redisAssert ... (char*)-1) = 'x'; 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 - Computing time on Linux: granularity and precision

**********************Original edit********************** I am using different kind of clocks ... -licensing/ ... or you may use a trial version 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 - char and the usual arithmetic conversion rules

I know this question has been asked and seemingly answered a gazillion times over but I can't seem to match the answers to ... .e. a=1 and b=2. 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 - Declaring a global variable `extern const int` in header but only `int` in source file

I was experimenting with GCC and found out that you can declare external variables const in header files but keep ... fails to warn me about? 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 - Find the sum of all the multiples of 3 or 5 below 1000

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of ... ",sum); getchar(); 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 - False sharing and pthreads

I have the following task to demonstrate false sharing and wrote a simple program: #include <sys/times.h> ... or explain why it happens. 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 - libcurl delays for 1 second before uploading data, command-line curl does not

I am using libcurl to send an API command to a local service (i.e. on 127.0.0.1). The program is ... ? Edit The server is based on mongoose 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 there a compiler feature to inject custom function entry and exit code?

Currently coding on Windows with VS2005 (but wouldn't mind knowing if there are options for other compilers and ... in this request I suspect. 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 - undefined reference to `WinMain@16' collect2.exe: error: ld returned 1 exit status

I am using eclipse CDT to test the Intel instructions and below is my program: #define cpuid(func,ax,bx,cx, ... help me regarding the issue. See Question&Answers more detail:os...

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

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323 views

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c - NetBeans settings for GCC

When I click on project properties I can set Warning level (More Warnings) and Command Line -> Additional ... everytime I create new project. 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 is it worse to initialize a two dimensional array like this?

for(int i = 0; i<100; i++) for(int j = 0; j<100; j++) array[j][i] = 0; // array ... , do the two means of initialization have equal performance? 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 - Malloc segmentation fault

Here is the piece of code in which segmentation fault occurs (the perror is not being called): job ... /vgpreload_memcheck-amd64-linux.so) See Question&Answers more detail:os...

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

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453 views

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c - Pointers inside shared memory segment

I've been trying this for hours, and google all the things I kind think of, but I'm going crazy. I ... ->rows and ->collumns was succesfull) 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 the definition of "arithmetic operation" in C99?

In C99, the term arithmetic operation appears 16 times, but I don't see a definition for it. The term ... just the use of arithmetic operators. See Question&Answers more detail:os...

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

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472 views

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c - Why putchar, toupper, tolower, etc. take a int instead of a char?

In C, strings are arrays of char (char *) and characters are usually stored in char. I noticed that some ... if someone ask me one day. 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 does "implicit declaration of function" mean?

#include <stdio.h> int main() { int a = 4; int b = 3; addNumbers(a, b); } int ... saying implicit declaration of function addNumbers()? See Question&Answers more detail:os...

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

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790 views

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c - printf not print on the console in eclipse?

#include<stdio.h> int main() { int n, s, i; do { printf("n= "); // here is the problem ? scanf(" ... fflush(stdout); What is the problem here ? 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 aren't bitfields allowed with normal variables?

I wonder why bitfields work with unions/structs but not with a normal variable like int or short. This works: struct ... easier: var.x = 123; 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 transpose a matrix in CUDA/cublas?

Say I have a matrix with a dimension of A*B on GPU, where B (number of columns) is the leading ... while keep the original data unchanged. See Question&Answers more detail:os...

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

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440 views

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c - Disabling disk cache in linux

In a class project my teacher told us to make some code evaluations (C language) and to do so we need to disable ... how can I do this? Thanks. See Question&Answers more detail:os...

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

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396 views

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c - How allocate or free only parts of an array?

See this example: int *array = malloc (10 * sizeof(int)) Is there a way to free only the first 3 blocks? ... indexes that don't begin with 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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392 views

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c - long long vs int multiplication

Given the following snippet: #include <stdio.h> typedef signed long long int64; typedef signed int int32; ... from a different architecture). See Question&Answers more detail:os...

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

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