37.c

//Question: Write a program to swap value of two variables using pointer.

#include <stdio.h>

void swap(int *a, int *b) {
    int temp;
    temp = *a;  
    *a = *b;    
    *b = temp;  
}

int main() {
    int x, y;

    
    printf("Enter the value of x: ");
    scanf("%d", &x);
    printf("Enter the value of y: ");
    scanf("%d", &y);

    printf("\nBefore swapping:\n");
    printf("x = %d, y = %d\n", x, y);

    
    swap(&x, &y);

    printf("\nAfter swapping:\n");
    printf("x = %d, y = %d\n", x, y);

    return 0;
}