if...else/if...else if...else..的简单使用

            Console.writeline("输入分数");
            string fs = Console.readline();
            int score = Convert.toint32(fs);
            #region ======判断======
            if (score >= 0 && score < 60)
            {
                console.writeline("不及格，请及时补考");
            }
            else if (score >= 60 && score < 80)
            {
                console.writeline("恭喜考试通过，成绩良好");
            }
            else if (score >= 80 && score < 100)
            {
                console.writeline("恭喜考试通过，成绩优秀");
            }
            else
            {
                console.writeline("输入错误");
            }
            console.writeline("结束");