#include <iostream.h>void swap (int &i, int &j);main() {    int a = 1, b = 2;    cout << "a and b:" << a << " " << b << endl;    swap (a,b);    cout << "a and b:" << a << " " << b << endl;    return 0;}void swap (int &i, int &j) {    int t=j;    j = i;    i = t;}