~cpp
#include<iostream>
using namespace std;
void swap(int *a, int *b);
void main()
{
int a=1, b=18;
cout << a<<" "<< b<<endl;
swap(&a, &b);
cout <<a<<" "<<b<<endl;
}
void swap(int *a,int *b)
{
int c;
c = *b;
*b = *a;
*a = c;
}










