编制一个程序，统计低于60分，60～69分，70～79分，80～89分，90～99分和100分的人数，并输出显示统计结果。

1、成绩分等部分采用分支结构，统计所有成绩则用循环结构完成，显示统计结果采用DOS功能调用。

2、统计学生成绩和显示统计结果两部分内容用子程序结构来完成。-The preparation of a program, statistics less than 60 points, 60 to 69 minutes, 70 ~ 79 minutes, 80 to 89 points, 90 to 99 the number of points and 100 points, and output display results. 1, part of the branch structure of classification results, statistics, scores are all done with the loop structure, display results using DOS function calls. 2, the statistical results of student performance and display statistics subroutine structure with two parts to complete.