How to use enum with input in MQL5?

I created my enum:

#property script_show_inputs

enum MYENUM
{
    first,
    second
};

input MYENUM response;

int OnInit()
{
    if (response == first)
    {
        printf("first");
    }

    if (response == second)
    {
        printf("second");
    }
}

It looks working before init, you can click on drop down and choose value. But when OnInit() starts it always default "first" value with no matter which was chosen.

How to use enum with input?

This is where MQL4/5 has a bit of introspection. The variable name for the input will be replaced (in the input window) by a single line comment following it's declaration, and the same goes for enum fields.

#property script_show_inputs

enum MYENUM
{
    first, //First choice
    second //Second choice
};

input MYENUM response = first; //Which choice?

int OnInit()
{
    if (response == first)
        printf("first");
    else if (response == second)
        printf("second");
}

The input window will read Which choice? | First choice instead of response | first