问题如下：
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 F
B F F C C A
D C E F
Sample Output
2.00
1.83
Unknown letter grade in input
代码如下：
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{ char a[1000];
float sum;
int count,flag;
while(gets(a))
{
flag=1;
count=sum=0;
for(int i=0;i<strlen(a);i+=2)
{
if(a[i]=='E')
{
flag=0;
break;
}
else
{
if(a[i]=='A')
{
sum+=4;
count++;
}
else if(a[i]=='B')
{
sum+=3;
count++;
}
else if(a[i]=='C')
{
sum+=2;
count++;
}
else if(a[i]=='D')
{
sum+=1;
count++;
}
else if(a[i]=='F')
{
count++;
}
}
}
if(flag==1)
printf("%.2f\n",sum/count);
else
printf("Unknown letter grade in input\n");
}
system("pause");
return 0;
}
在编译软件上测试时对的，但提交上去确实WA。不知道错在哪，求指教
慕设计2395807
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