static void Main(string[] args)
{
Console.WriteLine("Addition");
Console.WriteLine("========");
Console.WriteLine("Enter number a : ");
int a = Convert.ToInt16(Console.ReadLine());
Console.WriteLine("Enter number b : ");
int b = Convert.ToInt16(Console.ReadLine());
Console.WriteLine("The result is: " + Calculator.Addition(a, b));
//Console.WriteLine(Calculator.Addition(4,5));
//Console.WriteLine(Calculator.Divide(20, 5));
//Console.WriteLine(Calculator.Multiplication(5, 20));
//Console.WriteLine(Calculator.Subtraction(10, 5));
//Console.WriteLine(Calculator.Addition(5.5, 6.7));
//Console.WriteLine(Calculator.Divide(100.0, 6.0));
//Console.WriteLine(Calculator.Multiplication(15.5, 14.2));
//Console.WriteLine(Calculator.Subtraction(25.0, 10.0));
Console.ReadKey();
}