static void Main()
{
Console.WriteLine("enter first number");
string input = Console.ReadLine();
double num1, num2;
bool result = Double.TryParse(input, out num1);
if (!result)
{
Console.WriteLine("enter a number");
return;
}
Console.WriteLine("enter second number");
result = Double.TryParse(Console.ReadLine(), out num2);
if (!result)
{
Console.WriteLine("enter a number");
return;
}
Console.WriteLine("Enter Add,Divide");
CalculateFactory factory = new CalculateFactory();
ICalculate obj = factory.GetCalculate(Console.ReadLine());
obj.Calculate(num1, num2);
Main();
}
static void Main(string[] args = null)
{
double num1, num2;
Console.WriteLine("Enter first number ?");
var result1 = double.TryParse(Console.ReadLine(), out num1);
if (!result1)
{
Console.WriteLine("Enter a number !!");
return;
}
Console.WriteLine("Enter second number ?");
var result2 = double.TryParse(Console.ReadLine(), out num2);
if (!result2)
{
Console.WriteLine("Enter a number !!");
return;
}
Console.WriteLine("Choose calcualtion method (Add/Substract/Divide");
// Base classs = derive class object
// Return selected object to execute relevent task (e.g. Add)
var calObject = new CalculateFactory().GetCalculation(Console.ReadLine());
calObject.Calculate(num1, num2);
Console.ReadLine();
Console.Clear();
Main();
}