main()
    {
    int score;
    scanf("%d",&score);
    if(score<0&&score>100)printf("you put a wrong score.");
    else if(score<60)printf("you score is E.");
    else if(score>=60&&score<70)printf("you score is D.");
    else if(score>=70&&score<80)printf("you score is B.");
    else if(score>=80&&score<90)printf("you score is C.");
    else printf("you score is A.");
    }
输入大于100的数 还是显示you score is A. 不知道怎么回事 请指教。
谢谢。

#include<stdio.h>
main()
{
    int score;
    scanf("%d",&score);
    if(score<0 || score>100)
        printf("you put a wrong score.");
    else
        if(score<60)
            printf("you score is E.");
   
        else
            if(score>=60&&score<70)
                printf("you score is D.");
   
            else
                if(score>=70&&score<80)
                    printf("you score is B.");
   
                else
                    if(score>=80&&score<90)
                        printf("you score is C.");
   
                    else
                        printf("you score is A.");
}

if(score<0&&score>100) 问题在这行
正确的是:
if(score<0 || score>100)

谢谢 谢谢
我也想明白为什么错了。

score<0&&score>100  。。。。？
虽然是计算机，可也找不出符合条件的啊！

程序的第五行if(score<0&&score>100)应改为if(score<0||score>100)

3楼正解

if(score<0||score>100)判断完成后如果socre不符合要求应return，否则就转到printf("you score is E.")或最后一句else printf("you score is A.");