// Methods - Struct with methods using extend
extern func Std_Io_PrintLine(s: String);
extern func Std_Io_PrintInt(n: int);

struct Rectangle {
    width: int;
    height: int;
}

extend Rectangle {
    func Area(self: Rectangle) -> int {
        return self.width * self.height;
    }
    
    func Perimeter(self: Rectangle) -> int {
        return 2 * (self.width + self.height);
    }
}

func Main() -> int {
    let rect: Rectangle = Rectangle { width: 10, height: 5 };
    
    Std_Io_PrintLine("Rectangle:");
    Std_Io_PrintLine("Width = ");
    Std_Io_PrintInt(rect.width);
    Std_Io_PrintLine("");
    Std_Io_PrintLine("Height = ");
    Std_Io_PrintInt(rect.height);
    Std_Io_PrintLine("");
    Std_Io_PrintLine("Area = ");
    Std_Io_PrintInt(rect.Area());
    Std_Io_PrintLine("");
    Std_Io_PrintLine("Perimeter = ");
    Std_Io_PrintInt(rect.Perimeter());
    Std_Io_PrintLine("");
    
    return 0;
}