错在哪里了

Question

 string[] name = {"吴松","钱东宇","伏晨","陈陆","周蕊","林日鹏","何昆","关欣"};
            int[] score= {90,65,88,70,46,81,100,68};
            int temp = score[0];
            for (int i = 0;i < 8;i++)
              {
                  int sum = sum + score[i];
              }
               int avg = sum/8;
               for (int i = 0;i < 8;i++)
            {
              if(score[i] > avg)
                 {
                     string name1 = name1 + " " + name[i];
                 }
            }
            {
            Console.WriteLine("平均分是{0},高于平均分的有{1}",avg,name1);
            }   

Answer 1

恕我菜鸟比较笨，我想先问下int sum = sum + score[i];，这种格式对吗？而且还是在for循环里定义的，定义完没初始化就直接拿去用，而且需要每次循环定义一次num嘛？还有for里面定义的可以在for循环的外面使用嘛？？？，下面name也类似