C Program to swap two numbers using call by Reference


In this program, You will learn how to swap two numbers using call by Reference in C.


Call by Reference

void swap(int *x, int *y){ }


Example: How to swap two numbers using call by Reference in C

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#include<stdio.h>

void swap(int *x, int *y) {
    *(x) = *(x) + *(y);
    *(y) = *(x) - *(y);
    *(x) = *(x) - *(y);
}

int main() {

    int a, b, s;

    printf("Enter two numbers : ");
    scanf("%d%d",&a,&b);

    swap(&a, &b);

    printf("\nAfter swap a is : %d", a);
    printf("\nAfter swap b is : %d", b);

    return 0;
}

Output:

Enter two numbers : 20 30
After swap a is : 30
After swap b is : 20