系统应具备的功能：

（1）从键盘上输入五个学生的考研成绩；

（2）实现直接插入排序、二分插入排序、对各科成绩，以及平均成绩从小到大排序；

（3）比较各种插入排序的优劣。

-System should have the function: (1) input from the keyboard on the study section of the results of five students　(2) for direct insertion sort, binary insertion sort, for all subjects, and the average score from small to large order　(3) to compare the kinds of advantages and disadvantages of insertion sort.