Recent questions tagged C

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c - Error: No previous prototype for function. Why am I getting this error?

// screen.h #ifndef screen_h #define screen_h #define MAC 1 #define WIN 2 #define LNX 3 #ifdef PLATFORM ... suggestions/hints are appreciated! 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 - Use printf to format floats without decimal places if only trailing 0s

Is it possible to format a float in C to only show up to 2 decimal places if different from 0s using printf? Ex: 12 = ... > 12.10 12.12 => 12.12 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's the meaning of the %m formatting specifier?

The output for this code printed out ‘Success’. printf("%m "); 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 - Solving Rubik's cube programmatically

I am trying to develop a program for solving a Rubik's cube in C. I used back tracking technique for this. ... to solve this by using shortcuts. 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 find the offset of the section header string table of an elf file?

I have to write a C program that prints an ELF file. I'm having trouble figuring out where the section ... of the section header string table? 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 - Get loaded address of a ELF binary, dlopen is not working as expected

I'm trying to get the loaded address of an ELF binary, but dlopen doesn't work as expected: void *elf = ... binary? (0x0848000 in this case) 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 - Memory alignment on modern processors?

I often see code such as the following when, e.g., representing a large bitmap in memory: size_t width ... for various processors? 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 - Finding taxicab Numbers

Find the first n taxicab numbers. Given a value n. I would like to find the first n taxicab numbers. A taxicab ... 24 20683 4 32 18 30 32832 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 - Finding the first n largest elements in an array

I have got an array containing unique elements. I need to find out the first n largest elements in the array ... to change the original array!! 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 - Listen to multiple ports from one server

Is it possible to bind and listen to multiple ports in Linux in one application? 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 does strchr implementation work

I tried to write my own implementation of the strchr() method. It now looks like this: char *mystrchr(const ... there :( Can someone 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 - How can I simulate mouse events from code?

I would like to simulate mouse events using the Win32 API; how can I do it? What I want to do is simulate the ... And I would be coding in 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 - If volatile is useless for threading, why do atomic operations require pointers to volatile data?

I've been reading from many sources that the volatile keyword is not helpful in multithreaded scenarios. However, this ... if it's not useful? 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 - Struct timeval to printable format

Could you please help me how to format a struct timeval instance to human readable format like "2010-01-01 15:35:10.0001"? 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 - Pointer will not work in printf()

Having an issue with printing a pointer out. Every time I try and compile the program below i get the following error: ... ", pt1); 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 - What does __inline__ mean ?

I am trying to learn C. Reading through some code, I came across a line like this: __inline__ void () ... ... of a function make it different? 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 ssize_t vs int

Code I've got a function which I can write in one of four possible ways: int do_or_die(int retval); int ... to know that too, for future. 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 - Cannot find libcrypto in Ubuntu

I want to try one program which have makefile on it but when I put make in the shell the error was: g++ -g - ... .8 What should I do to fix 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 - Including a header file from another directory

I have a main directory A with two sub directories B and C. Directory B contains a header file structures.c: ... structures.h file into main.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 - How does GCC optimize out an unused variable incremented inside a loop?

I wrote this simple C program: int main() { int i; int count = 0; for(i = 0; i < 2000000000; i++) ... I expected (one sum instead of many sums)? 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 normalize a mantissa

I'm trying to convert an int into a custom float, in which the user specifies the amount of bits reserved for ... isn't making any 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 - Coming back to life after Segmentation Violation

Is it possible to restore the normal execution flow of a C program, after the Segmentation Fault error? struct A ... it look like? Other ideas? See Question&Answers more detail:os...

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

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320 views

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c - Understanding empty main()'s translation into assembly

Could somebody please explain what GCC is doing for this piece of code? What is it initializing? The original code ... .c Thank You, kunjaan. See Question&Answers more detail:os...

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

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568 views

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c - How to use Fork() to create only 2 child processes?

I'm starting to learn some C and while studying the fork, wait functions I got to a unexpected output. At least ... you see where my error is. 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 - Memcpy() in secure programming?

I recently stumbled across an article that claims Microsoft is banning the memcpy() function in its secure ... similar but safer functionalilty? 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 - Adding section to ELF file

I need to be able to add an arbitrary section to an ELF file. I cannot use GPL code in this program, so ... rather not write my own ELF code. 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 - Fastest way to find out minimum of 3 numbers?

In a program I wrote, 20% of the time is being spent on finding out the minimum of 3 numbers in an ... the stack. Please see this 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 - how to find if the machine is 32bit or 64bit

Is there anyway from a C prog to find whether the OS is currently running in 32bit or 64bit mode. I ... configurations. Thanks for the advice. See Question&Answers more detail:os...

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

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