#include<stdio.h>
main()
{
    int score=0;
    printf("please input your score:\n");
        scanf("%d",&score);
        if((score>100)||(score<0))
            printf("please input your score again!\n");
        switch(score/10)
        {
           case 10:
               printf("the score is A.\n")
               break；
           case 9:
               printf("the score is A.\n")
               break；
           case 8:
               printf("the score is B.\n")
               break；
           case 7:
               printf("the score is C.\n")
               break；
           case 6:
               printf("the score is D.\n")
               break；
           default:
               printf("the score is E.\n")
        }
}

这个c语言是课本上的，但是输入后提示错误，和书上一样的，请问哪里是中文的啊，有点不太明白

这个我是用另一种方法做的，提示一个错误，就是在“int:x=100，&&，x<100；”这个地方错误


#include<stdio.h>
main()
{
    int: x=100,&&,x<100；
         else if(x<=100,&&,x>=90)
              printf("a\n")
              else if(x<90,&&,x>=80)
                   printf("b\n")
                   else if(x<80,&&,x>=70)
                        printf("c\n")
                        else if(x<70,&&,x>=60)
                             printf("d\n")
                                else if(x<0)
                                  printf("Error\n")
}

哦，明白了，我试试啊，谢谢啊！

恩，谢谢了