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2399：GPA

题目描述
Each course grade is one of the following five letters: A, B, C, D, and F. (Note that there is no grade E.) The grade A indicates superior achievement , whereas F stands for failure. In order to calculate the GPA, the letter grades A, B, C, D, and F are assigned the following grade points, respectively: 4, 3, 2, 1, and 0.
输入解释
The input file will contain data for one or more test cases, one test case per line. On each line there will be one or more upper case letters, separated by blank spaces.
输出解释
Each line of input will result in exactly one line of output. If all upper case letters on a particular line of input came from the set {A, B, C, D, F} then the output will consist of the GPA, displayed with a precision of two decimal places. Otherwise, the message "Unknown letter grade in input" will be printed.
输入样例 
A B C D F
B F F C C A
D C E F
输出样例 
2.00
1.83
Unknown letter grade in input
来自杭电HDUOJ的附加信息
Author 2006Rocky Mountain Warmup
Recommend lcy
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 HDU “Valentines Day” Open Programming Contest 2009-02-14
源链接： HDU-2399
最后修改于 2020-10-25T22:53:06+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)