Recent questions tagged C

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I've been trying to open a file and output text, but I keep getting errors. So I thought I would start at the very ... .exe. How do I fix 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 - Why "initializer element is not a constant" is... not working anymore?

static const int a = 42; static const int b = a; I would expect a compilation error in such code. The ... bug? Is this a compiler extension? 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 prevent fgets blocks when file stream has no new data

I have a popen() function which executes tail -f sometextfile. Aslong as there is data in the filestream obviously I ... for it (see this post). 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 there a way to convert from UTF8 to ISO-8859-1?

My software is getting some strings in UTF8 than I need to convert to ISO 8859 1. I know that UTF8 domain is ... from UTF8 to iso-8859-1. 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 - SSE register return with SSE disabled

I am in the following situation: I am writing code for a kernel that does not allow SSE instructions I need ... do the multiply. Thanks Nathan 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 - Reading from file using fgets

I am reading from file of format 1 32 43 23 32 43 123 43 54 243 123 2222 2 Here is my code snippet. ... or so). How to solve this 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 - Why does "printf" not produce any output?

I am learning to program in C. Could you explain why nothing is printed here? #include <stdio.h> int main (void) { ... ; printf ("%s", a); } 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 does printf return?

Today in my interview, the interviewer asked: printf is a function and every function returns something; int, void, ... as it's a function? 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 - Union element alignment

If I have a union, C standard guarantees that the union itself will be aligned to the size of the largest element. union U ... (&u.s == &u.c[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 - Does any floating point-intensive code produce bit-exact results in any x86-based architecture?

I would like to know if any code in C or C++ using floating point arithmetic would produce bit exact ... by just configuring the compiler? 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 does do{} while(0) work in macro?

Though this topic has been discussed many times in this forum and all other forums, still I have doubts. Please ... How does this lock then? 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 sscanf correctly and safely

First of all, other questions about usage of sscanf do not answer my question because the common answer is to ... must conform to C99 standard. 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 check Ethernet in Linux?

I need the test case for Ethernet in Linux using C code to check eth0. If eth0 is down, we enable the net then ... if up and the test is passed. 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 in a multithreaded program

Following is a program which uses pthreads. #include <pthread.h> // posix threads #include <stdio.h> #include <stdlib. ... 0 and 4 print twice? 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 - AVX/SSE version of xorshift128+

I am trying to make the fastest possible high quality RNG. Having read http://xorshift.di.unimi.it/ , ... to this speedup in practice? 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 - Function prototype declared inside main - best practice?

Is this a good style to have the function prototype declared inside of the main function? I was looking at a C ... ,&myage); return (myage); } 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 power down the computer from a freestanding environment?

I'm making a protected-mode OS based on Intel's x86 architecture, and was looking for some information on how ... help me with this 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 - What does -fwrapv do?

Can anyone provide some code examples that act differently when compiled with fwrapv vs without. It says -fwrapv is ... with or without fwrapv. 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 perform a non-blocking fopen on a named pipe (mkfifo)?

If I have a program which creates and attempts to open a named pipe using mkfifo, how can I open a pipe for ... is running on a linux system) 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 - error C2143: syntax error : missing ';' before 'type'

I am new to programming C.. please tell me what is wrong with this program, and why I am getting this error: error ... number++); } getch(); } 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 - Populating a va_list

Is there a way to create a va_list from scratch? I'm trying to call a function that takes a va_list as a ... I can't change func's signature. 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 proper implementation for hardware emulation?

I'm going to programme a Game Boy emulator (Z80 is the CPU in case somebody is not familiar with it), ... opcode map or something like 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 - Why doesn't pressing enter return ' ' to getch()?

#include <stdio.h> #include <conio.h> main() { char ch,name[20]; int i=0; clrscr(); printf("Enter a ... instead of . Kindly let me know. 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 do you use offsetof() on a struct?

I want the offsetof() the param line in mystruct1. I've tried offsetof(struct mystruct1, rec.structPtr1.u_line.line) ... } logo; } u_line; }; 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 exactly should I not call free() on variables not allocated by malloc()?

I read somewhere that it is disastrous to use free to get rid of an object not created by calling malloc, is this true? 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 - How to make YY_INPUT point to a string rather than stdin in Lex & Yacc (Solaris)

I want my yylex() to parse a string rather than a file or standard input. How can I do it with the Lex and Yacc provided with Solaris? 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 - Process Linkage Table and Global Offset Table

I am reading this article on PLT (Process Linkage Table) and GOT (Global Offset Table). While the purpose ... I completely missing the point. 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 can I prevent scanf() to wait forever for an input character?

I want to fulfill the following things in a console application: If user inputs a character, the application will ... it was an obvious mistake. See Question&Answers more detail:os...

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

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