HDU 2004 成绩转换

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    while(~scanf("%d",&n))
    {
        if(n>100||n<0)
            printf("Score is error!\n");
           else
           {
               if(n>=90&&n<=100)
            printf("A\n");
        else if(n>=80&&n<=89)
            printf("B\n");
        else if(n>=70&&n<=79)
            printf("C\n");
        else if(n>=60&&n<=69)
            printf("D\n");
        else
            printf("E\n");
           }
    }
    return 0;
}