Find sum of first n natural numbers Dry Run in C

Find sum of first n natural numbers is an interactive C dry run visualizer from the For 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.

Find sum of first n natural numbers Program Code

#include <stdio.h>
int main() {
    int n, sum = 0, i;
    printf("Enter a number: ");
    scanf("%d", &n);
    
    for(i = 1; i <= n; i++) {
        sum = sum + i;  // or sum += i
    }
    
    printf("Sum of 1 to %d = %d\n", n, sum);
    return 0;
}

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