enum in C++

The enum keyword is also used to define the variables of enum type. 
```
#include <iostream>
using namespace std;

enum colors{red=5, black};
enum suit{heart, diamond=8, spade=3, club};

int main() {
   cout <<"Color:"<<red<<","<<black<<endl; // Color:5,6
   cout <<"Suit:"<<heart<<","<<diamond<<","<<spade<<","<<club<<endl; // Suit:0,8,3,4
   return 0;
}
```