2018-12-13第一题

效果

14494383-899f6106110c56c0.png

代码

        double c = 0;
            Console.WriteLine("请选择一个运算符 1.加法\t2.减法\t3.乘法\t4.除法");
            int shuzi1 = Convert.ToInt32(Console.ReadLine());
            Console.Write("请输入数字a:");
            Double a1 = Convert.ToDouble(Console.ReadLine());
            Console.Write("请输入数字b:");
            Double b1 = Convert.ToDouble(Console.ReadLine());
            double jieguo = Suanshu(shuzi1, a1, b1, c);
            Console.WriteLine("*****运算结果为:{0}",jieguo);
            Console.ReadKey();
        }

        static Double Suanshu(int shuzi, Double a, Double b, Double c)
        {
            switch (shuzi)
            {
                case 1:
                    c = a + b;
                    break;
                case 2:
                    c = a - b;
                    break;
                case 3:
                    c = a * b;
                    break;
                case 4:
                    c = a / b;
                    break;
            }
            return c;

        }