gaoyangu / TheChernoCPP

TheChernoCPP

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23. Enum

• just integer
• a set of values
• a way to a name to a value

⭐EnumPratice

int A = 0;
int B = 1;
int C = 2;  // are not group

int main()
{
    int value = B;

    if(value == B){
        // Do something here    
    }
}

// by defult the first one will be 0,
// increment one by one
enum Example : unsigned char{
    A, B, C
};

int main()
{
    Example value = B;

    if(value == B){
        // Do something here    
    }
}

66. Type Punning

67. Union

• only have one member
• want multiple ways to address that same data

⭐UnionPratice

struct Union{
    union{
        float a;
        int b;
    };
};

Union u;
u.a = 2.0f;
std::cout << u.a << ", " u.b << std::endl;