5.9成绩if-else语句

#include<stdio.h>
int main()
{
   int score;
   printf("输入score的值:");
   while(scanf("%d",&score))
   {
       if(score>=90&&score<=100)
       {
            printf("A\n");
       } 
       else if(score>=80&&score<90)
       {
           printf("B\n");
       }
       else if(score>=70&&score<80)
       {
           printf("C\n");
       }
       else if(score>=60&&score<70)
       {
           printf("D\n");
       }
       else if(score>=0&&score<60)
       {
           printf("E\n");
       }
   }
    return 0;
}