static void UseCalculator()
{
var caculate = new calculator();
Console.WriteLine(caculate.Add(2, 4, 6, 8));
Console.WriteLine(caculate.Add(new int[] { 10, 4, 6, 8 }));
}
static void Main(string[] args)
{
calculator cal = new calculator();
int z = cal.add(10, 20);
int p = cal.sub(20, 10);
int q = cal.mul(20, 10);
int r = cal.div(20, 10);
int s = cal.mod(20, 10);
Console.WriteLine("add:{0}", z);
Console.WriteLine("sub:{0}", p);
Console.WriteLine("mul:{0}", q);
Console.WriteLine("div:{0}", r);
Console.WriteLine("mod:{0}", s);
Console.ReadLine();
}