how to use enum class c++ code example

Example 1: enum c++

enum Colors
{
        BLACK,
        GREEN,
        BLUE,
        RED
};

Example 2: enum c++

enum Foo { a, b, c = 10, d, e = 1, f, g = f + c };
//a = 0, b = 1, c = 10, d = 11, e = 1, f = 2, g = 12

Example 3: enum c++

enum season 
{   spring = 0, 
    summer = 4, 
    autumn = 8,
    winter = 12
};