Replace all occurrences of a digit with another digit Dry Run in C

Replace all occurrences of a digit with another 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.

Replace all occurrences of a digit with another digit Program Code

#include <stdio.h>
int main() {
    int num, oldDigit, newDigit, result = 0, place = 1, temp;
    printf("Enter number, old digit, new digit: ");
    scanf("%d %d %d", &num, &oldDigit, &newDigit);
    
    for(temp = num; temp != 0; temp /= 10) {
        int digit = temp % 10;
        if(digit == oldDigit) {
            digit = newDigit;
        }
        result = digit * place + result;
        place *= 10;
    }
    
    printf("Result: %d\n", result);
    return 0;
}

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