怎么改？最后一个数值总是错误的？

```c
#include<stdio.h>
#include<string.h>
struct Student{//定义结构体 
    char num[10];
    char name[16];
    char sex[2];
    int age;
    char course[2];
    union{
        char reason[4];
        int score;
    }exam;
}s[4]={//初始化 
    {"1001","LingLing","w",20,"t",98},
    {"1002","li Ming","M",19,"f","ill"},
    {"1003","WangHua","M",22,"t",88},
    {"1004","ZhangLi","W",20,"t",78}
};
enum find{
    s1,
    s2,
    s3,
    s4
}stu;

int main(){
    int stu;
    scanf("%d",&stu);
    if(strcmp(s[stu-1].course,"t")){
        printf("%s %s %s %d %d",s[stu-1].num,s[stu-1].name,s[stu-1].sex,s[stu-1].age,s[stu-1].exam.score);
    }//判断union 
    else {
        printf("%s %s %s %d %s",s[stu-1].num,s[stu-1].name,s[stu-1].sex,s[stu-1].age,s[stu-1].exam.reason);
    }
    return 0;
} 

```

if(strcmp(s[stu-1].course,"t"))改为
if(!strcmp(s[stu-1].course,"t"))