Questions tagged [c]

C is a general-purpose programming language used for system programming (OS and embedded), libraries, games and cross-platform. This tag should be used with general questions concerning the C language, as defined in the ISO 9899 standard (the latest version, 9899:2018, unless otherwise specified — also tag version-specific requests with c89, c99, c11, etc). C is distinct from C++ and it should not be combined with the C++ tag absent a rational reason.

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Why does the C preprocessor insert an extra space?

When I run the C preprocessor on this source file: 1+1 1-1 A+1 A-1 A+A A-A #define A 1 A+1 A-1 A+A A-A I get this output with clang -E -P: 1+1 1-1 A+1 A-1 A+A A-A 1 +1 1 -1 1 +1 1 -1 And almost ...
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Windows Memory mapping | Bytes change when mapped

I started a few weeks ago with learning about PE-structure and memorymapping of pe. I think understand now the basics of this concept. But then i realized something strange: When i compared the binary ...
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33 views

Comparing a string with a struct member in C

I am attempting to create a small ticket pricing system. The user inputs the people accompanying them to the theme park as a command line argument (senior/adult/child/student) including themselves (...
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2answers
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How do I make the program give the “Invalid Grade” message and ask for the grade to be entered again infinitely as long as the grade is >100 or <100

So in this C code the program will give an error message that says "Invalid grade" and it asks the user to enter the grade again if the entered grade is >100 or <0, but this only ...
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27 views

(it skip statements and output is every time else)

What is wrong here (it skip statements and output is every time else) #include<stdio.h> #include<stdlib.h> int main(){ float num,dm,cm,mm; int units; printf("program ...
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8 views

Getting “ERROR L127: Unresolved Exernal symbol” in C166

Currently, I am trying to compile an ancient operating system, after I had fixed several issues. The Problem I get now is that when my IDE (qVision) is trying to link the files, I get the error: "...
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11 views

OpenMP Search of a max parallel version runs slower than serial

I'm trying to parallelize a piece of code that has to do a LUP factorization. In particular the Partial pivoting and the subsequent swap of the rows. The problem is that the parallelize version runs ...
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28 views

Passing foo(int *) as argument to foo(void*) in X

A have a functions: void somefunc(void func(void *)) { ... } void foo(int *num) {...} I'm trying to pass foo as an argument to somefunc but receive a warning. What is the correct way to do this?
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How get multiple key inputs at the same time on windows and in c [closed]

This probably has been answered but I haven't found a proper way to get multiple key inputs on windows and in c. I want a straight forward answer. No "wHeRe iS tHe cOdE?" and "wHy wOuLd ...
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1answer
20 views

Trying to figure out why my C program is only grabbing one of my repeated digits

I am writing a C program that will take user input and then print out what repeated digits were inputted. #include <stdbool.h> #include <stdio.h> int main(void) { bool ...
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1answer
39 views

can not assign a 2-d array to struct in c

I'm writing a snake game. I have a structure which contains data of the snake, such as position of snake length etc. This is the snake.h file: #ifndef SNAKE_HEAEDER #define SNAKE_HEAEDER #include &...
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33 views

Hand optimizing assembly code without the stack?

I am trying to hand optimize my assembly code for this multiplication function I have written in C. long multiply(long x, long y) { return x * y; } So far I have been able to get my assembly ...
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9 views

PWM Signals not generating correctly on stm32 f767zit

I am working with an stm32 f767zit and I am trying to generate PWM signals to control servos, but they are not generating correctly. I followedd the tutorial from here Deep Blue Embedded and was able ...
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1answer
39 views

Fifty Dice Game in C programming

I am having to write a C program to roll dice for two people. After the winner is determined, I need it to loop back around and ask to play again. If q is entered, the program will end. If user press ...
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32 views

Unexpected output due to printf() and scanf() [duplicate]

I implemented a C program where you enter a sequence of numbers separated with a space like 1 2 3 4 5. The program sees that the max time limit of entering each sequence is 15 seconds. The code ...

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