编写程序，由键盘输入某位同学的百分制成绩，要求：

#include "stdio.h"
#include "stdlib.h"
int main()
{
int score,level;
char band;
printf("Input Score:");
scanf("%d",&score);
if ( score > 100 || score < 0 )
{
printf("输入错误！n");
return 0;
}
level=score/10;
switch(level)
{
case 10:
case 9: band='A'; break;
case 8: band='B'; break;
case 7: band='C'; break;
case 6: band='D'; break;
default: band='F'; break;
}
printf("%d的等级为%cn",score,band);
system("pause");
return 0;
}