public void Sum()
{
StringCalculatorImplementation calculator = new StringCalculatorImplementation();
Write("Enter number1:");
calculator.Num1 = ReadLine();
Write("Enter numbeer2:");
calculator.Num2 = ReadLine();
int sum = Convert.ToInt32(calculator.Num1) + Convert.ToInt32(calculator.Num2);
Write($"Sum of {calculator.Num1} and {calculator.Num2} is { sum}");
}
static void Main(string[] args)
{
StringCalculatorImplementation cal = new StringCalculatorImplementation();
cal.Sum();
}