##
Println(E);
Println(Pi);
var x := 2.5;
Println(Sqrt(x));
Println(Ln(x)); // natural logarithm
Println(LogN(10,x)); // logarithm with base
Println(Exp(x));
Println(Abs(-x));
Println(Floor(x));
Println(Ceil(x));
var y := 4.1;
Println(x ** y);