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;
}