Swap Two Numbers Using Pointers

1#include <stdio.h>
2
3// Function receives pointers (addresses)
4void swap(int *a, int *b) {
5    int temp = *a;  // Get value at address a
6    *a = *b;        // Put b's value at a's address
7    *b = temp;      // Put temp at b's address
8}
9
10int main() {
11    int x = 10, y = 20;
12    
13    printf("Before swap: x = %d, y = %d\n", x, y);
14    
15    swap(&x, &y);  // Pass addresses
16    
17    printf("After swap:  x = %d, y = %d\n", x, y);
18    
19    return 0;
20}