public static void Main() { Console.WriteLine(GeometryUtilities.CalcTriangleArea(3, 4, 5)); Console.WriteLine(ArithmeticUtilities.NumberToDigit(5)); Console.WriteLine(ArithmeticUtilities.FindMax(5, -1, 3, 2, 14, 2, 3)); PrintUtilities.PrintNumber(1.3, 1); PrintUtilities.PrintPercent(0.75, 0); PrintUtilities.PrintAlignedNumber(2.30, 8); Console.WriteLine(GeometryUtilities.CalcDistance(3, -1, 3, 2.5)); Console.WriteLine("Horizontal? " + GeometryUtilities.IsHorizontalLine(3, -1, 3, 2.5)); Console.WriteLine("Vertical? " + GeometryUtilities.IsVerticallLine(3, -1, 3, 2.5)); Student peter = new Student("Peter", "Ivanov", "Sofia", new DateTime(1992, 3, 17)); Student stella = new Student("Stella", "Markova", "Vidin", new DateTime(1993, 11, 3)); Console.WriteLine("{0} older than {1} -> {2}", peter.FirstName, stella.FirstName, peter.IsOlderThan(stella)); }