Check whether a number is prime using function Dry Run in C

Check whether a number is prime using function is an interactive C dry run visualizer from the Functions programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Check whether a number is prime using function Program Code

#include <stdio.h>
#include <stdbool.h>

bool isPrime(int n) {
    if(n <= 1) return false;
    for(int i = 2; i * i <= n; i++) {
        if(n % i == 0) return false;
    }
    return true;
}

int main() {
    int num = 29;
    if(isPrime(num))
        printf("%d is prime\n", num);
    else
        printf("%d is composite\n", num);
    return 0;
}

View the complete Functions programs page.