Compute digital root (sum digits until single digit) Dry Run in C

Compute digital root (sum digits until single digit) 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 digital root (sum digits until single digit) Program Code

#include <stdio.h>
int main() {
    int num;
    printf("Enter a number: ");
    scanf("%d", &num);
    
    // Mathematical formula for digital root
    int digitalRoot = 1 + (num - 1) % 9;
    
    // Handle zero separately
    if(num == 0) digitalRoot = 0;
    
    printf("Digital root of %d = %d\n", num, digitalRoot);
    return 0;
}

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