VS复习 -- if···else和if···else嵌套语句

注意：理清逻辑，画出逻辑分支图，理清思路

1.if语句

2.if...else语句

3.if..else if...else

 static void Main(string[] args)
         {
             Console.WriteLine("输入分数：");

             string fs = Console.ReadLine();
             int score = Convert.ToInt32(fs);

             #region  判断分数
             if (score >=  && score < )
             {
                 Console.WriteLine("不及格，补考");
             }
             else if (score >=  && score < )
             {
                 Console.WriteLine("恭喜及格");
             }
             else if (score >=  && score <= )
             {
                 Console.WriteLine("恭喜优秀");
             }
             else
             {
                 Console.WriteLine("输入有误");
             }
             #endregion

             Console.WriteLine("结束");
         }

3.输入分数，如果小于60，再判断加分项，然后输出是否及格

  static void Main(string[] args)
         {
             Console.WriteLine("输入分数：");

             string fs = Console.ReadLine();
             int score = Convert.ToInt32(fs);

             if (score < )
             {
                 Console.WriteLine("是否认真做作业？(是，否)");

                 string zuoye = Console.ReadLine();

                 #region ======加分=======
                 if (zuoye == "是")
                 {
                     score = score + ;

                     if (score < )
                     {
                         Console.WriteLine("不及格");
                     }
                     else
                     {
                         Console.WriteLine("凑合及格");
                     }
                 }
                 else
                 {
                     Console.WriteLine("不及格了");
                 }
                 #endregion
             }
             else
             {

             }

             Console.WriteLine("结束");
         }