# include<stdio.h>
int main()
{
char name[10];
char sex;
double maths,english,computer;
int age;
printf("please enter your name age sex:");
scanf("%s%d %c",&name,&age,&sex);
printf("piease enter your scores(maths,english,computer):");
scanf("%f%f%f",&maths,&english,&computer);
(maths>=90&&english>=90&&computer>=90)?printf("You are excellent\n"):printf("You should study hard\n");
return 0;
}
为什我每次无论输入那三个数  结果都是You should study hard

%f 改为 %lf

# include<stdio.h>
int main()
{
    char name[10];
    char sex;
    double maths,english,computer;
    int age;
    printf("please enter your name age sex:");
    scanf("%s%d%c",&name,&age,&sex);
    while (getchar() != '\n')
        continue;
    printf("piease enter your scores(maths,english,computer):");
    scanf("%lf%lf%lf",&maths,&english,&computer);
    while (getchar() != '\n')
        continue;
    (maths>=90&&english>=90&&computer>=90)?printf("You are excellent\n"):printf("You should study hard\n");
   
    return 0;
}
缓冲区没有清除，
回车符（\n）的ASCII码小于90，
所以楼主不管输入多大的数字
结果都是“你应该努力学习”