Program_47.c

// Program 47: Write a program to swap two numbers without using a third variable (call by reference).
#include<stdio.h>
int swap(int* , int *);
int swap(int *first_term ,int *second_term){
    *first_term = *first_term + *second_term ;
    *second_term = *first_term - *second_term ;
    *first_term = *first_term - *second_term ;
    printf("After swapping (inside function), The value of first and second term are %d and %d respectively.\n", *first_term,*second_term);

    return 0;

}
int main(){
    int first_term , second_term ;
    printf("Enter the value of the first number:");
    scanf("%d",&first_term);
    printf("Enter the value of the Second number:");
    scanf("%d",&second_term);

    printf("Before swapping , The value of first and second term are %d and %d respectively.\n", first_term,second_term);
    swap(&first_term,&second_term);
    printf("After swapping (inside main), The value of first and second term are %d and %d respectively.\n", first_term,second_term);

    return 0;
}