#include<iostream>
using namespace std;

void swap(int a, int b){
    int temp = a;
    a= b;
    b = temp;
}
int main(){
    int a =2 , b = 4;
    cout << a <<" "<< b << endl;
    swap(a,b);
    cout  << a << " " << b << endl;
    return 0;
}

enum spectrum {red, orange, yellow, green, blue, violet,indigo, ultraviolet};
spectrum band;