17.Example of call by value & call by reference

 #include<stdio.h>

void swap(int a,int b);

void swap1(int *a,int *b);

int main(){

    int a,b;

    printf("Enter the value of a and b :");

    scanf("%d %d",&a,&b);

    swap(a,b);

    printf("\nThe value of a and b after swap(wrong method) is %d and %d",a,b);

    swap1(&a,&b);

    printf("\nThe value of a and b after swap is %d and %d",a,b);

    return 0;

}

    void swap(int x,int y)//call by value

    {

        int temp;//do not swap

        temp=x;

        x=y;

        y=x;

    }

    void swap1(int *x,int *y)//call by reference

    {

     int temp;

        temp=*x;

        *x=*y;

        *y=temp;  

    }