    #include <stdio.h>
    #include <conio.h>
    void swap(int *,int *);
    void main()
    {
    	int a=10,b=20;
    	clrscr();
    	printf("\nVALUES OF a AND b BEFORE SWAPING ARE %d %d",a,b);
    	swap(&a,&b);
    	printf("\nVALUES OF a AND b AFTER SWAPING ARE %d %d",a,b);
    	getch();
    }
    void swap(x,y)
    int *x,*y;
    {
    	int t;
    	t=*x;
    	*x=*y;
    	*y=t;
    }