杭电oj 2004 成绩转换

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