Recent questions tagged C

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c - Can we modify the value of a const variable?

From this article. Another use for declaring a variable as register and const is to inhibit any non-local change of ... 42; /* not allowed */ 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 - C99 remove stricmp() and strnicmp()?

Is the functions stricmp() and strnicmp() removed in C99? I always get warning implicit declaration of funtion ... make that warning happen? 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 any way to get gcc or clang to warn on explicit casts?

What I'm trying to do is find all explicit casts from type double or float to any other type in some source ... this? Language is C. 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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c - What makes it possible for glibc malloc to compare pointers from different "objects"?

Comparing pointers with a relational operator (e.g. <, <=, >= or >) is only defined by the C standard when ... that lets them get away with 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 - Make an https request using sockets on linux

How do I make an http request using sockets on linux? currently, I'm getting HTTP/1.1 301 Moved Permanently // ... to make more clean for you. 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 sizeof(array) and sizeof(&array[0]) gives different results?

#include <stdio.h> int main(void){ char array[20]; printf( " Size of array is %d ", sizeof(array) ); //outputs ... in 1 byte as far as I know? 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 a core dump file in Linux? What information does it provide?

What is a core dump file in linux? What all information does it provide? 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 - Difference between macro and preprocessor

From what I understand , #define blah 8 is a macro . While , # is the pre-processor directive . Can we say ... Please correct me if I am wrong. 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 - Advantages of strncmp over strcmp?

Seems strncmp is usually recommended than strcmp, what are the advantages? I think it could be related to ... strlen("LiternalString")); 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 - Set timeout for winsock recvfrom

I'm trying to set up a blocking socket to timeout after 16 ms of trying to recvfrom() on a port. Platform is ... sizeof(int))) return 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 - Add compiler option without editing Makefile

I should compile a program written in C through a Makefile. I should insert into the Makefile, some option ... Makefile without writing into 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 - Signing a message using ECDSA in OpenSSL

How do I set the private key for signing messages when using ECDSA in OpenSSL programmatically? I have the ... I doing this completely wrong? 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 this code to modify a string not work?

With c-style strings, how do you assign a char to a memory address that a character pointer points to? For example, in ... ", num ); 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 - Object file to binary code

Let's suppose I have a C file with no external dependency, and only const data section. I would like to ... assembly with PC related adressing. 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 - Significance of %x and ~

int m=32 printf("%x" , ~m); Output of this statement is ffdf and without ~ output is 20. What is the significance of %x and ~? 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 actual relation between assembly, machine code, bytecode, and opcode?

What is the actual relation between assembly, machine code, bytecode, and opcode? I have read most of the SO ... process? And if so how? 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 - Calling setns from Go returns EINVAL for mnt namespace

The C code works fine and correctly enters the namespace, but the Go code always seems to return EINVAL ... namespace failed: invalid argument 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 - Reading from file using read() function

I have to write a program that reads numbers in separate lines each. Is it possible to read only one line of the ... while (bytes_read != 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 - X11 - Draw on Overlay Window

I want to draw simple primitives at specific pixels on the screen (similar to this question). In order to do ... still see the windows below? 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 - Possible to build a shared library with static link used library?

I can build a executable with gcc with static link: gcc -static xxx.c -o xxx So I can run xxx ... statically linked its externel reference in. 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 I write a Windows application without using WinMain?

Windows GUI applications written in C/C++ have 'WinMain' as an entry point (rather than 'main'). My ... having to write 'WinMain'). 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 - Resetting pointer to the start of file

How would I be able to reset a pointer to the start of a commandline input or file. For example my function is ... as (./function < inputs.txt) 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 the first argument of getline a pointer to pointer "char**" instead of "char*"?

I use getline function to read a line from STDIN. The prototype of getline is: ssize_t getline(char **lineptr, ... /Linaro 4.4.4-14ubuntu5). 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 & c++ default global variable linkage, multiple declaration & definition problem

For example: code1.c / .cpp int a; // ... and so on code2.c / .cpp int a; int main(void) { ... variable linkage difference between C & C++? 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 - Does free() remove the data stored in the dynamically allocated memory?

I wrote a simple program to test the contents of a dynamically allocated memory after free() as below. (I know ... also depend on the compiler? 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 valgrind report my memory as "definitely lost"?

Consider this code: #include <stdlib.h> int* alloc() { return malloc(250 * sizeof(int)); } int main( ... ://stackoverflow.com/a/3857638/578749 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 - Problems using fread() on stdin under win32

I'm trying to parse data from stdin in binary mode under Win32. The first thing my code does is to check for a ... : 0x4 What am I doing wrong? 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 link OpenSSL with emscripten?

I'm trying to compile some C code that uses OpenSSL with emscripten, but I get unresolved symbol warnings like: ... buffer); 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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