static void Main(string[] args)
{
//Console.WriteLine("Hello World!");
Arithmetic a1 = new Arithmetic();
a1.GetNumber();
Console.WriteLine("Choose\n1: Addition\n2: Subtraction\n3: Multiplication\n4: Division");
int caseSwitch = Convert.ToInt32(Console.ReadLine());
switch (caseSwitch)
{
case 1:
Console.WriteLine(a1.Addition());
break;
case 2:
Console.WriteLine(a1.Subtraction());
break;
case 3:
Console.WriteLine(a1.Multiplication());
break;
case 4:
Console.WriteLine(a1.Division());
break;
default:
break;
}
}