private static SuanFa GetSuanFaByNumberAndOpt(string opt, int num1, int num2)
{
SuanFa sf = null;
//判断符号
switch (opt)
{
case "+": sf = new Add(num1, num2); break;
case "-": sf = new Sub(num1, num2); break;
}
return(sf);
}
static void Main(string[] args)
{
Console.WriteLine("请您输入第一个数字");
int num1 = Convert.ToInt32(Console.ReadLine());//异常处理
Console.WriteLine("请输入第二个数字");
int num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("请输入运算符+-*/");
string opt = Console.ReadLine();
SuanFa sf = GetSuanFaByNumberAndOpt(opt, num1, num2);
if (sf != null)
{
Console.WriteLine(sf.Result());
Console.ReadKey();
}
}