说明：   　学生信息管理系统 一、 课题内容和要求 设计一个简化的学生成绩管理系统，并用C语言实现。对该系统的要求如下： 　1. 该系统应实现以下功能 (1)按班级按课程从文件中读入相应的平时成绩、期中考试成绩和期末考试成绩。 (2)三个成绩对总评成绩的百分比被定义为常数，各占总成绩的20 、30 和50 。 (3)计算每位学生的总评成绩。 (4)计算该班级某课程的总平均成绩。 (5)算处于优、良、中、及格、不及格的学生人数以及占总人数的百分比。其中100-90为优，89-80为良，79-70为中，69-60为及格，60分以下为不及格。 (6)按要求输出成绩在优、良、中、及格、不及格各区间的学生学号。
(A student information management system, subject to design a simplified content and student achievement management system and the C language. The system requirements are as follows: (1) The system shall perform the following functions (1) according to the curriculum by class read from a file corresponding usual result, midterm and final exam scores. (2) the percentage of the total grades three grades are defined as constants, and 20 each of the total score of 30 and 50 . (3) calculate the overall rating for each student achievement. (4) calculating the overall average score for the class of a course. (5) count is excellent, the percentage of good, in passing, as well as the number of students failing the total number. Which is superior 100-90 ,89-80 ,79-70 as good as the passing ,69-60 was 60 points or less failed. (6) the required output results in excellent, good, medium, pass, do not pass each section of students to learn numbers.)