51 lines
1.0 KiB
C++
51 lines
1.0 KiB
C++
#include<stdio.h>
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#include<string.h>
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int main()
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{
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char s[1000];
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int i,num,flag;
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double t;
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while(gets(s))
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{
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t=0;
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num=0;
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i=0;
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flag=0;
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while(s[i])
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{
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switch(s[i++])
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{
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case 'A':
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t+=4.0;
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num++;
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continue;
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case 'B':
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t+=3.0;
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num++;
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continue;
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case 'C':
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t+=2.0;
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num++;
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continue;
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case 'D':
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t+=1.0;
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num++;
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continue;
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case 'F':
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num++;
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continue;
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case ' ':
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continue;
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default:
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flag=1;
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break;
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}
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}
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if(flag==1)
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printf("Unknown letter grade in input\n");
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else
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printf("%.2lf\n",t/num);
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}
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return 0;
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}
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