Code shared from run.dlang.io.

main.d

import std;

void main()
{
    foreach (n; 1 .. 101)
    {
        string rules = (
            (n % 3 == 0 ? "Fizz" : "") ~ 
            (n % 5 == 0 ? "Buzz" : "")
        );

        "%d: %s".writefln(n, rules ? rules : n.to!string);
    }
}