第二次作业

namespace boke
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b;
            Random rd = new Random();
            a = rd.Next(0, 11);
            b = rd.Next(0, 11);
            Console.WriteLine("第一个数：{0}",a);
            Console .WriteLine ("第二个数：{0}",b);
            Console.WriteLine("请输入运算符号：‘+‘,‘-‘,‘*‘,‘/‘");
            string c = Console.ReadLine();
            if (c == "+")
            {
                int d;
                d = a + b;
                Console.WriteLine ("结果是：");
                Console.ReadLine();
                Console.WriteLine("正确答案是：{0}", d); 
            }
            else if (c == "-")
            {
                int d;
                d = a - b;
                Console.WriteLine("结果是：");
                Console.ReadLine();
                Console.WriteLine("正确答案是：{0}", d); 
            }
            else if (c == "*")
            {
                int d;
                d = a * b;
                Console.WriteLine("结果是：");
                Console.ReadLine();
                Console.WriteLine("正确答案是：{0}", d); 
            }
            else if (c == "/")
            {
                int d;
                d = a / b;
                Console.WriteLine("结果是：");
                Console.ReadLine();
                Console.WriteLine("正确答案是：{0}", d); 
            }
            else
            {
                Console.WriteLine("您输入的运算符无效");
            }
            Console .ReadLine ();
        }
    }
}