Recent questions tagged C

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c - How can I pass the index of a for loop as the argument for pthread_create

I am using a for loop to create a number of threads and passing the index i as an argument as follows: ... slowing down the for loop? 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 - Why would the same code yield different numeric results on 32 vs 64-bit machines?

We are working on a library of numeric routines in C. We are not sure yet whether we will work with single ... not on the 32-bit machine. 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 a compiler allowed to add functions to standard headers?

Is a C compiler allowed to add functions to standard headers and still conform to the C standard? I read this ... -standard itoa to stdlib.h. 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 - Valgrind showing memory leak for printf and unused blocks

#include <string.h> #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]){ char *str ... Where does the 373 blocks come from? 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 - gdb prints wrong values when modifying arguments

System Fresh install of codeblocks 12.11 + mingw pack. win7 64 gcc 4.7.1 gdb 7.5 Example code Compiled with -g ... idea what could be 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 - Adding two numbers without using operators

I found this following code for addition of two numbers without using the + operator. code to add 3 and 4: ... . Any help would be appreciated. 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 - Yoda Conditions and integer promotion

When comparing a type larger than int, with an integer constant, should I place the constant on the left or the ... where int64_t is long long)? 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 - Bind error while recreating socket

A have the following listener socket: int sd = socket(PF_INET, SOCK_STREAM, 0); struct sockaddr_in addr; bzero( ... way to avoid bind 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 - Dereferencing an out of bound pointer that contains the address of an object (array of array)

Is the following well defined, for different values of REF? #include <stdio.h> #define REF 1 #define S 1 int main( ... of same type (C++ only) 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 - Disassemble, modify, and reassemble executable

How can I disassemble an executable on my mac using ndisasm and reassemble and link it using nasm and ld? This is ... . What am I doing 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 - What's the return value from a function call if that function doesn't really provide one

Let's say we have following code: int func(char str[], int len) { // Don't return anything here. } ... . Can anyone explain why this happen? 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 - OpenCV 2.1: Runtime error

I have a program which uses OpenCV. I have a webcam and it captures color frames and I want to convert the color ... *~"); exit(EXIT_STATUS); } 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 printf's behaviour when printing an int as float?

I am using dev cpp on windows7 to compile my code. int d = 0x12; char* e = (char*)&d; printf("%d %d ", ... | 0 | 0 | 0 | 0x28ff40 |76869F1D 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 use feof(FILE *f)?

I'm having a hard time with a do-while loop, that is supposed to stop when we reach the end of the file. ... . How should I write it 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 - Store __m256i to integer

How can I store __m256i data type to integer? I know that for floats there is : _mm256_store_ps(float *a, __m256 b) where ... w ] , T ); } } 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 - Behaviour of scanf when newline is in the format string

Below is the copy of my code. Basically, I need to create a program that calculates pay based on "paycodes" eg the ... is: %d ", counter4); } 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 - program not executing anything after a call to system()

I am calling a command via system(command) call. But no other code is executed after this system() call. ... see after getting printed ever. 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 effect of second argument in _builtin_prefetch()?

The GCC doc here specifies the usage of _buitin_prefetch. Third argument is perfect. If it is 0, compiler ... purpose of the second argument? 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 getting this warning in "if (fd=fopen(fileName,"r") == NULL)"?

FILE *fd; if (fd=fopen(fileName,"r") == NULL) { printf("File failed to open"); exit(1); } This is ... to pointer when the brackets are not put. 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 - Need for prefixing a function with (void)

I recently came across a rather unusual coding convention wherein the call for a function returning "void" is ... convention of some sort? 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 - gcc detect duplicate symbols/functions in static libraries

Is there any way we can get gcc to detect a duplicate symbol in static libraries vs the main code (Or another ... to detect such a situation ? 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 - Converting from Swift string to const char*

I'm trying to pass a const char * to an old C library converted from a Swift string in Swift. This is the ... that doesn't work either. 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 the scanf function in while loop

I am attempting to format a space-delimited user input for a programming assignment. Essentially, the input consists ... why this is happening? 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 flush stdin in fgets loop

I have found the example of clearing stdin using while((c = getchar()) != ' ' && c != EOF) on here a few ... (input_buffer, "quit", 4) != 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 - Conditional tests in primality by trial division

My question is about the conditional test in trial division. There seems to be some debate on what conditional ... that will work with OpenMP. 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 way to join two double linked list

In the Linux kernel source, the list_splice is implemented with __list_splice: static inline void __list_splice(const ... list->next instead? 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 execstack required to execute code on the heap?

I wrote the code below to test shellcode (for unlinking /tmp/passwd) for an assignment in a security class. ... 702f 7061 7373 7764 tmp/passwd 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 do I insert and delete some characters in the middle of a file?

I want to insert and delete some chars in the middle of a file. fopen() and fdopen() just allow ... existing library that allow these actions? See Question&Answers more detail:os...

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

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