Call by Value and Call by Reference using User Define Function

Demonstrate call by value and call by reference using the UDF concept. [ Swap two values with a function. Demonstrate Call by Value and Call by Reference]

1. Call By Value

#include<stdio.h>

void swap(int a, int b);

void main(){

    int x, y, a, b;

    printf("Enter two values:");

    scanf("%d %d",&x,&y);

        swap(x,y); //call by value

   //printf("\nAfter Swapping: x=%d y=%d",x,y);

}

void swap(int a, int b){

    int temp;

    temp = a;

    a = b;

    b = temp;

    printf("\nAfter Swapping: x=%d y=%d",a,b);

}

2. Call By Reference

#include<stdio.h>

void swap(int *a, int *b);

void main(){

    int x, y;

    printf("Enter two values:");

    scanf("%d%d",&x,&y);

    swap(&x,&y); //call by Reference

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

}

void swap(int *a,int *b){

    int temp;

    temp = *a;

    *a = *b;

    *b = temp;

}