void swap(int*,int*);
void main()
{
int a=10,b=20,*x=&a,*y=&b;
clrscr();
printf("\na=%d---b=%d",a,b);
printf("x-%d..y-%d\n",x,y);
printf("*x-%d  *y--%d\n",*x,*y);
printf("&a--%d &b--%d\n",&a,&b);
swap(&a,&b);
printf("\na=%d---b=%d",a,b);
printf("x-%d..y-%d\n",x,y);
printf("*x-%d  *y--%d\n",*x,*y);
printf("&a--%d &b--%d\n",&a,&b);
}
void  swap(int *a,int*b)
{
int t;
t=*a;
*a=*b;
*b=t;
}