static void Main(string[] args)
{
//虚方法、抽象类、接口
//面向对象计算器 案例
while (true)
{
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);
double res = cal.GetResult();
Console.WriteLine(res);
Console.ReadKey();
}
}
public static CalFather GetCal(string opear, double n1, double n2)
{
CalFather cal = null;
switch (opear)
{
case "+": cal = new Add(n1, n2);
break;
case "-": cal = new Sub(n1, n2);
break;
case "*": cal = new Cheng(n1, n2);
break;
case "/": cal = new Chu(n1, n2);
break;
}
return(cal);
}