求大佬帮看看怎么修改才能改成多行输入,再多行输出.初学

#include<stdio.h>
int main()
{
int x;
scanf("%d",&x);
int i;
for(i=0;i<x;i++)
{
int n,mark;
scanf("%d",&n);
mark=n>=0&&n<=100?n/10:-1;
switch(mark)
{
case 10:
case 9:printf("优秀\n");
break;
case 8: printf("良\n");
break;
case 7: printf("中\n");
break;
case 6: printf("及格\n");
break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:printf("不及格\n");
break;
default:printf("Input error!\n");
}
}
return 0;
}