先从键盘读入的8个学生的6门课成绩存放在二维数组student中(每一行存储一个学生的数据，第0列为学号，第1～6列依次为6门课的成绩)，再从键盘读入一个学号，在student查找该学生是否存在，若存在，则输出其平均成绩，若不存在，则显示“not Find!”。(The results of the 8 students' 6 classes first read from the keyboard are stored in the two-dimensional array student (each row is stored in a student's data, zeroth is a school number, first to 6 in order of 6 courses), and then a school number is read from the keyboard to find out whether the student exists in the student, and if there is, the average result is not stored. If it does not exist, if it does not exist In this case, it shows "not Find!".)