GPA

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 3580 Accepted Submission(s): 1466

Problem Description

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.

Input

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.

Output

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.

Sample Input

A B C D FB F F C C AD C E F

Sample Output

2.001.83Unknown letter grade in input

Author

2006Rocky Mountain Warmup

Source

HDU “Valentines Day” Open Programming Contest 2009-02-14

Recommend

lcy

这道题其实真的没有什么难度，但是输出格式还是要注意，尤其对于我这样的低级新手来说

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.

这句话真的是一定要好好读清楚。

所以修正之后最后的代码应为：

#include
    
     using namespace std;int main(){		char rank;	double score = 0.0;	int cnt = 0;	int flag2 = 1;		while(scanf("%c",&rank) != EOF){			if (rank == ' ')				continue;			if	(rank == '\n'){				if(flag2){					printf("%.2f\n",score/cnt);				}else{					printf("Unknown letter grade in input\n");				}				flag2 = 1;				cnt = 0;				score = 0;				continue;			}			if(rank == 'A')				score += 4;			else if(rank == 'B')				score += 3;			else if(rank == 'C')				score += 2;			else if(rank == 'D')				score += 1;			else if(rank == 'F')				score += 0;			else{				flag2 = 0;			}			cnt ++;		}	return	0;}

嗯这是第一篇，如有兴趣的朋友，也请多指正。