用C语言 IF ...ELSE的格式
将下列表格打出
Result             Grade              Comment
80 and above        A                 Execllent Work
70-79               B                 Well Done
60-69               C                 Good
50-59               D                 Satisfactory
40-49               E                 Must Try Harder
Below 40            F                 Poor







以及下列表格
 Infinity Business College
Student results
Please enter students grade:76
The student received a grade B
Well Done

Infinity Business College Student results
Please enter students grade:45
The student received a grade E
Must Try Harder



多谢各位先
因为回国落下了最初的课程，现在回到学校，突然要交作业，简直是一头雾水！
从来没学过C语言，不知道为什么这学期刚开始，就搞这么难的来折磨人。。。。。
求求众大侠，帮帮忙吧！！！！

thank you!!!!!