要求统计并输出一个表格，表格内容包括学号，各课分数，总分和平均分，并标出三门均在90分以上者 实现对两个字符串大小的比较 编程打印出n*n（n＜0）阶的方阵-Ask the Census and Statistics and the output of a form, the form includes No. school, the class scores, the total score and average score, and three were marked for more than 90 points in the realization of the comparative size of the two strings programming print n* n (n <0) band of the square