#include "stdio.h"
void swap_function(int *, int *); //function declaration
int main()
{
    // varibale declaration
    int first_no, second_no;

    // taking  two input from user
    printf("Enter the value of first number :");
    scanf("%d", &first_no);
    printf("Enter the value of second number :");
    scanf("%d", &second_no);

    // printing the value of first_no, second_no in main() function, before swap_function call
    printf("Before calling swap_function (),the values in main () function first_no = %d, second_no = %d\n\n",first_no,second_no);
    
    // swap_function call
    swap_function(&first_no,&second_no);  
    
    //printing the value of first_no, second_no in main() function, after swap_function call
    printf("After calling swap_function (), the values in main () function first_no = %d, second_no = %d\n\n",first_no,second_no); 
return 0;
}

// function definition
void swap_function (int *first, int *second)
{
    int temp_var;
    temp_var = *first;
    *first=*second;
    *second=temp_var;
    printf("After swapping values in swap_function() first = %d, second = %d\n",*first,*second);
}