public static JiSuan GetOptResult(string opt, int num1, int num2)
{
JiSuan js = null;
switch (opt)
{
case "+": js = new Add(num1, num2);
break;
case "-": js = new Jianfa(num1, num2);
break;
}
return(js);
}
static void Main(string[] args)
{
Console.WriteLine("请输入第一个数");
int num1 = Convert.ToInt32(Console.ReadLine());
while (true)
{
try
{
if (num1 > -10000 & num1 < 10000)
{
break;
}
else
{
Console.WriteLine("输入的数据超过范围，请重新输入");
num1 = Convert.ToInt32(Console.ReadLine());
}
}
catch
{
Console.WriteLine("输入的数据有误，请重新输入");
num1 = Convert.ToInt32(Console.ReadLine());
}
}
Console.WriteLine("请输入第二个数");
int num2 = Convert.ToInt32(Console.ReadLine());
while (true)
{
try
{
if (num2 > -10000 & num2 < 10000)
{
break;
}
else
{
Console.WriteLine("输入的数据超过范围，请重新输入");
num2 = Convert.ToInt32(Console.ReadLine());
}
}
catch
{
Console.WriteLine("输入的数据有误，请重新输入");
num2 = Convert.ToInt32(Console.ReadLine());
}
}
Console.WriteLine("请输入符号 + - * /");
string opt = Console.ReadLine();
while (true)
{
try
{
if (opt == "+" || opt == "-" || opt == "*" || opt == "/")
{
break;
}
else
{
Console.WriteLine("输入的符号有误，请重新输入");
opt = Console.ReadLine();
}
}
catch
{
Console.WriteLine("输入的符号有误，请重新输入");
opt = Console.ReadLine();
}
}
JiSuan js = GetOptResult(opt, num1, num2);
int result = js.GetResult(num1, num2);
Console.WriteLine("计算的结果是{0}", result);
Console.ReadKey();
}