شرح enumeration in c++

#include <string>
using namespace std;

int main()
{

// enum ..  enumration
        // 0    1     2     3
enum colrs{ red,blue,black,white };

cout<<red<<"  :  "<<blue<<"  :  "<<black<<"  :   "<<white<<endl;

}
//--------------------
#include <iostream>
#include <string>
using namespace std;

int main()
{

// enum ..  enumration
        // 0    1     2     3
enum colrs{ red=50,blue,black=60,white };


cout<<red<<"  :  "<<blue<<"  :  "<<black<<"  :   "<<white<<endl;


}