只是用来保存~~~

#include <stdio.h>

void main()

{    int score;/*score:成绩*/

     printf("请输入成绩:");

     scanf("%d",&score);

     if (score>100||score<0)

printf("输入错误");

else if (score>=90 &&score<=100)

   printf("优秀\n");

      else if (score>=70)

      printf("良好\n");

        else if (score>=60)

printf("及格\n");

else printf("不及格\n");

}

#include <stdio.h>

void main()

{    int score,scale;/*score:成绩*/

     printf("请输入成绩:");

scanf("%d",&score);

if (score==100)

scale=9;

else  scale=score/10;

switch (scale)

     { case 0:

  case 1:

  case 2:

  case 3:

  case 4:

  case 5: printf("不及格\n");

      break;

  case 6:printf("及格\n");

     break;

  case 7:

  case 8:printf("良好\n");

     break;

  case 9:printf("优秀\n");

     break;

  default:printf("输入错误\n");

}

}