Recent questions tagged C

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c - Class Scheduling to Boolean satisfiability [Polynomial-time reduction] Final Part

I'm working since few weeks now on a project really interesting but unfortunately with a very complex background. ... in advance, Best regards, 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 - Conditional move (cmov) in GCC compiler

I saw somewhere that the GCC compiler might prefer sometimes not using conditional mov when converting my code ... other than conditional mov? 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 causes a segmentation fault on a call to inb_p()?

I am getting a segmentation fault when trying to read a port with inb_p( ). I'm compiling this on a ... that the problem is hardware related. 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 trailing newline necessary in fgets?

When I search using keywords of 'fgets' and 'newline', there are many posts regarding how to remove the trailing ... is there a reason for 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 - access() Security Hole

I've been doing some shell writing and came across a recommendation for access() to check whether a file exists, ... shell that I used it for. 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 asterisk in a pointer declaration specific to the identifier and not the data type?

Silly question, but trying to grasp the underlying mechanics/philosophy to solidify my understanding. int myInt; // ... an integer. Brain hurts! 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 - i want to getchar twice but i cant

int main() { int r, c; r = getchar(); c = getchar(); putchar(r); putchar(c); printf(" "); return(0 ... input it but how come it doesnt do that? 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 behaviour when printing pointers

I have the following code: #include <stdio.h> typedef struct { int* arg1; int arg2; } data; int main(int argc, char ... I am using is GCC 4.8.2. 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 - Efficient way of doing 64 bit rotate using 32 bit values

I need to rotate a 64 bit value using 2 32 bit registers. Has anyone come across an efficient way of doing 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 - Program is skipping fgets without allowing input

Basically as the title says.. When my program is run from the console, it'll ask if you'd like to encrypt or ... to input any answers.. why for? 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 get the mode of a file descriptor?

I mean to use fdopen FILE *fdopen(int fd, const char *mode); In man pages, it is stated that " ... /File-Status-Flags.html#File-Status-Flags 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 I create a Win32 DLL without MSVCR90D.dll?

I am trying to recreate an existing C Win32 DLL with a single, simple function. I have managed to do ... Win32 DLL without this dependency? 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 - Compile a simple program on ubuntu arm

I have a simple program #include <glib.h> int main(){ g_print("hallo "); } and try to compile it on ... the linker does not find the reference? 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 - Mapping of Virtual Address to Physical Address

I have a doubt when each process has it's own separate page table then why is there s system wide page ... table will also solve my problem? 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 - UDP restreaming using socket resulting in NULL packets

I am implementing a UDP video redirection feature. Ideally incoming video packets should be processed and redirected to ... ? Any advice please? 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 - not able to read string after reading double data type

I am trying a c program with following input. 6 7.0 How are you I am able to read and print the integer ... 4.0 string variable is how are 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 - What are the properties of the Objects of type FILE

FILE objects are usually created by a call to either fopen or tmpfile, which both return a reference to one of ... or is it platform dependent? 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 scanf scans a null value

In the code below: #include <stdio.h> int main(){ char *name; int age; char *gen; printf("Your name: ... gen but the first two readings success? 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 - fork+exec without atfork handlers

I have a library which registers an atfork handler (via pthread_atfork()) which does not support multiple threads ... described here and 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 - swap in doubly linked list

I am trying to swap two nodes in a doubly linked list. Below is the part of program having swap function. int ... out..!! 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 - What happens when casting floating point types to unsigned integer types when the value would overflow?

I'm wondering what happens when casting from a floating point type to an unsigned integer type in C when the value ... really make sense to me. 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 - fgets() not working after fscanf()

I am using fscanf to read in the date and then fgets to read the note. However after the first iteration, ... char text[250]; } JournalEntry; 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 trick behind strcpy()/uninitialized char pointer this code?

#include <stdio.h> #include <string.h> #include <stdlib.h> void main () { char *imsi; unsigned int i; int ... the assignment (i = 10) included. 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 line following printf(), a call to sleep(), executed before anything is printed?

I thought I was doing something simple here, but C decided to go asynchronous on me. I'm not sure what's going ... I really don't know. 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 - unused volatile variable

If i declare a variable as volatile and if I dont use it any where in the program, will the compiler optimize ... variables in this case? tq. 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 - Convert binary tree to linked list

I am trying to create a linked list from a binary tree. The thing is, is it possible to use a simple linked list ... ; plist(l); } Thank you.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 - Shortcircuiting of AND in case of increment / decrement operator

In the code below: #include <stdio.h> int main() { int a = 1; int b = 1; int c = a || --b; int d = ... c = 1, d = 0 can anyone please explain? 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 - Good way to flush scanf buffer when invalid entry entered

I have been thinking of ways to flush bad entries in scanf functions to allow for loop prompts to do their job. ... standard to use that 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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