static void Main(string[] args)
{
//案例 面向对象计算器
Console.WriteLine("请输入第一个数字");
double n1 = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("请输入第二个数字");
double n2 = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("请输入运算符");
string opera = Console.ReadLine();
CalFather cal = GetCal(opera, n1, n2);
Console.WriteLine(cal.GetResult());
Console.ReadLine();
}
public static CalFather GetCal(string opera, double n1, double n2)
{
CalFather cal = null;
switch (opera)
{
case "+": cal = new Add(n1, n2);
break;
case "-": cal = new Sub(n1, n2);
break;
case "*": cal = new Multiply(n1, n2);
break;
case "/": cal = new Divide(n1, n2);
break;
}
return(cal);
}