Recent questions tagged C

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c - Binary compatibility over what range of machines?

I wrote a simple program in C and compiled it using GCC on Ubuntu. Will this file work on another machine? ... run on other operating systems? 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 do you include standard CUDA libraries to link with NVRTC code?

Specifically, my issue is that I have CUDA code that needs <curand_kernel.h> to run. This isn't included by ... haven't managed to find any. 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 function parameters after function name

int func(x) int x; { ............. What is this kind of declaration called? When is it valid/ ... C++, certain standard revisions and compilers? 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 macro results in incorrect output when used as part of a larger math expression - why does this happen?

This is a normal C routine program which i found out in some question bank. It is shown below: #define CUBE(p ... of 81 to this question above. 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 - Printf without newline in assembly

I've recently read this article on using printf and scanf in assembly: Meaning of intfmt: db "%d", 10, ... assembly language. Thanks in advance! 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 - mpz_t to unsigned long long conversion (gmp lib)

Is there a way to convert a mpz_t variable to unsigned long long in C?How about the other way around,from ull to ... in c++.Thanks in advance. 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 - Redefining function from standard library

Context: In a recent conversation, the question "does gcc/clang do strlen("static string") at compile time?" ... If so, what happens exactly? 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 - Strange behavior performing library functions on STDOUT and STDIN's file descriptors

Throughout my years as a C programmer, I've always been confused about the standard stream file descriptors. Some ... works for standard input? 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 __asm{}; return the value of eax?

Simple question. The function asm in C is used to do inline assembly in your code. But what does it return? Is ... if not, what does it return? 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 - Creating a mask with N least significant bits set

I would like to create a macro or function1 mask(n) which given a number n returns an unsigned integer with ... its arguments more than once. 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 GCC 4.8.2 complaining about addition under strict overflow?

Consider this code (bits.c): #include <assert.h> #include <inttypes.h> #include <stdio.h> static uint64_t pick_bits( ... , .-main .text ... 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 doesn't the compiler detect out-of-bounds in string constant initialization?

I read this question and its answer in a book. But I didn't understand the book's justification. Will the ... . Can anybody please explain this? 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 sizeof(char + char) return 4?

char??a,?b; ???? printf("%d",?sizeof(a+b)); What will printf write to the screen? I thought because ... write 4 if we are adding two chars? 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 EOF always negative?

Is EOF always negative? I'm thinking of writing a function that reads the next word in the input and ... the function would be incorrect. 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 is it legal to reference an undefined type inside a structure?

As part of answering another question, I came across a piece of code like this, which gcc compiles without ... leniency for structure pointers. 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 let a thread which blocks on recv() exit gracefully?

There is a thread likes this: { ...... while (1) { recv(socket, buffer, sizeof(buffer), 0); ..... ... how can I let the thread exit gracefully? 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 - Concatenate string literal with char literal

I want to concat a string literal and char literal. Being syntactically incorrect, "abc" 'd' "efg" renders a ... string out as a status message. 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 - strtok_r for MinGW

strtok_r is the reentrant variant of strtok. It is POSIX-conformant. However, it is missing from MinGW, and ... 's standard library functions? 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 - Properties of 80-bit extended precision computations starting from double precision arguments

Here are two implementations of interpolation functions. Argument u1 is always between 0. and 1.. #include < ... tangential to my question. 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 fseek and ftell to determine the size of a file has a vulnerability?

I've read posts that show how to use fseek and ftell to determine the size of a file. FILE *fp; long ... instead. Can anyone comment on this? 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 it standard for #if to assume undefined symbolic constants as 0?

In this c program #include<stdio.h> int main() { #if UnDefinedSymbolicConstant==0 printf("UnDefinedSymbolicConstant is ... this only in gcc? 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 - Are there sequence points in the expression a^=b^=a^=b, or is it undefined?

The allegedly "clever" (but actually inefficient) way of swapping two integer variables, instead of using ... s actually undefined behavior? 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 compiler generate additional sqrts in the compiled assembly code

I'm trying to profile the time it takes to compute a sqrt using the following simple C code, where readTSC() is a ... ----------- call readTSC 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 - Order of defining types

Is there any preference/convention/rule on order for defining a variable as static and long/double or other types? e ... ? above, a is variable. 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 - break in a case with return.. and for default

My OCD makes me add "break" when writing case statements, even if they will not be executed. Consider the following ... to have the break 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 - attach a terminal to a process running as a daemon (to run an ncurses UI)

I have a (legacy) program which acts as a daemon (in the sense it runs forever waiting for requests to service) ... asks what is wrong 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 - Combining two commands with a pipe

I'm trying to "merge" two commands in one (nonexistent) command and pipe it.By this I mean.. Suppose ... /tYGWwUjS http://pastebin.com/sNJhEg2Y 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 - Inserting text into file at specific offset using Win32 API

I am looking for a way to make speedy modifications to large multi-gigabyte files. Do the Win32 API support ... like this to maximize speed? See Question&Answers more detail:os...

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

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