Problem with using readln.

[JV via Digitalmars-d-learn]

Hello i'm kinda new to D language and i wanted to make a simple 
program
but somehow my input does no go to my if statements and just 
continues to ask for the user to input.Kindly help me

btw here is my sample code
    int func;
writeln("\t\tEnter Selection : ");
    func = readln;
    writeln(func);

    if(func == 1)
    {
        writeln("hello world");
    }
    if(func == 2)
    {
        writeln("hello world");
    }
    if(func == 3)
    {
        writeln("endtime");
    }
    if(func == 4)
    {
        writeln("hello world");
    }
    if(func == 5)
    {
        writeln("hello world");
    }