struct student
        {
            int num;
            char *name;
            char sex;
            char *major;
            int num;
        }boy[5]={{1,"郑银祥","男","计科",21},
                 {2,"周翔","男","计科",19},
        {3,"大明星","男","软工",20},
        {4,"小广东","男","计科",20},
        {5,"范欣晨","男","计科",20},
        {6,"宫成","男","计科",20}};
        
        
        struct student *ps;
        printf("床号\t姓名\t性别\t专业\t年龄\t\n");
        for(ps=boy;ps<boy+6;ps++)
            printf"%d\t%s\t%s\t%s\t%d\n",ps->num,ps->name,ps->sex,ps->major,ps->num);

惭愧，这些还没讲，自己看书学的点

为什么要把要用"M"才行呢？