文件名称:stu1
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（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30％、30％和40％。
（3）计算每位学生的总评成绩。
（4）计算该班级本课程的总平均成绩。
（5）计算处于优、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、成绩。
-(1) according to the course by class read from the file into the corresponding results in peacetime, interim and final examination results of examination results. (2) results of three percentage of the overall results are defined as constants, each with a total score of 30%, 30% and 40%. (3) calculate each student's overall results. (4) The calculation of the class of this course the total average score. (5) Calculation is excellent, good, medium and passing, failing and the number of students in the total percentage. You 100-90 for them, said through-80 ,79-to-70 for which 69-60 passes for 60 points below passing. (6) As required, the output results in excellent, good, medium and passing, failing the students learn the interval, results.
（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30％、30％和40％。
（3）计算每位学生的总评成绩。
（4）计算该班级本课程的总平均成绩。
（5）计算处于优、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、成绩。
-(1) according to the course by class read from the file into the corresponding results in peacetime, interim and final examination results of examination results. (2) results of three percentage of the overall results are defined as constants, each with a total score of 30%, 30% and 40%. (3) calculate each student's overall results. (4) The calculation of the class of this course the total average score. (5) Calculation is excellent, good, medium and passing, failing and the number of students in the total percentage. You 100-90 for them, said through-80 ,79-to-70 for which 69-60 passes for 60 points below passing. (6) As required, the output results in excellent, good, medium and passing, failing the students learn the interval, results.
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学生统计系统.cpp