Program in C for swapping of two values using functions

Write a program in C for swapping of two values using functions

#include<stdio.h>

#include<conio.h>

int swapval(int,int);

int swapref(int*,int*);

int a,b;

void main()

{

            clrscr();

            printf(“enter the two values\n”);

            scanf(“%d%d”,&a,&b);

            printf(“pass by value\n”);

            printf(“before function call a=%d b=%d “,a,b);

            swapval(a,b);

            printf(“after function swapval a=%d b=%d “,a,b);

            printf(“pass by reference\n”);

            printf(“before function call a=%d b=%d “,a,b);

            swapref(&a,&b);

            printf(“after function swapref a=%d b=%d “,a,b);

            getch();

}

swapval(int x,int y)

{

            int t;

            t=x;

            x=y;

            y=t;

            printf(“\nwith swap val x=%d y=%d”,x,y);

}

swapref(int*x,int*y)

{

            int *t;

            *t=*x;

            *x=*y;

            *y=*t;

            printf(“\nwith swapref x=%d y=%d “,*x,*y);

}