public static void Main(String[] args)
{
Calculator c = new Calculator();
char a;
String val;
int n1, n2, ans;
Console.Write("Enter integer: ");
val = Console.ReadLine();
n1 = Convert.ToInt32(val);
Console.Write("Enter integer: ");
val = Console.ReadLine();
n2 = Convert.ToInt32(val);
Console.Write("Enter operation: ");
val = Console.ReadLine();
a = Convert.ToChar(val);
switch (a)
{
case '+':
ans = c.Add(n1, n2);
Console.WriteLine("result: ");
Console.WriteLine(ans);
break;
case '-':
ans = c.Sub(n1, n2);
Console.WriteLine("result: ");
Console.WriteLine(ans);
break;
case '*':
ans = c.Mul(n1, n2);
Console.WriteLine("result: ");
Console.WriteLine(ans);
break;
case '/':
ans = c.Div(n1, n2);
Console.WriteLine("result: ");
Console.WriteLine(ans);
break;
}
Console.ReadKey();
}
