Form reverse without using extra variables (modifies original) Dry Run in C

Form reverse without using extra variables (modifies original) 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.

Form reverse without using extra variables (modifies original) Program Code

#include <stdio.h>
int main() {
    int num;
    printf("Enter a number: ");
    scanf("%d", &num);
    
    int reversed = 0;
    for(; num != 0; ) {
        reversed = reversed * 10 + (num % 10);
        num = num / 10;  // Original num is destroyed!
    }
    
    printf("Reversed: %d\n", reversed);
    printf("Original number is now lost (became 0)\n");
    return 0;
}

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