#include <stdio.h>
 
// Function to swap two numbers using pointers
void swap(int *x, int *y) {
    int temp;
 
    temp = *x;   // store value of x
    *x = *y;     // put y's value into x
    *y = temp;   // put temp's (old x) value into y
}
 
int main() {
    int a = 5, b = 10;
 
    printf("Before swap: a = %d, b = %d\n", a, b);
 
    swap(&a, &b);   // pass the addresses of a and b
 
    printf("After swap:  a = %d, b = %d\n", a, b);
 
    return 0;
}

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