Compute factorial series sum: 1! + 2! + ... + n! Dry Run in C

Compute factorial series sum: 1! + 2! + ... + n! 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.

Compute factorial series sum: 1! + 2! + ... + n! Program Code

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

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