Swap two numbers (call by reference using pointers) Dry Run in C

Swap two numbers (call by reference using pointers) is an interactive C dry run visualizer from the Functions 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.

Swap two numbers (call by reference using pointers) Program Code

#include <stdio.h>

void swapByReference(int *p, int *q) {
    int temp = *p;
    *p = *q;
    *q = temp;
}

int main() {
    int x = 5, y = 10;
    printf("Before: x=%d, y=%d\n", x, y);
    swapByReference(&x, &y);
    printf("After: x=%d, y=%d (SWAPPED!)\n", x, y);
    return 0;
}

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