c語言結構體

在我們的驅動開發中經常用到結構體，下面將結構體的基本用法總結如下：

#include<stdio.h>
#include<stdlib.h>

#define Debug

struct student{
    int old;   
    int score;
};

typedef struct master{
    int old;
    int score;
}ma;

typedef struct doctor{
    int old;
    int score;
}dor,*doctor;

typedef struct professor{
    int old;
    int score;
    struct master *ma_p;
    doctor doc_p;
}prof,*professor_p;

int main()
{
    struct student stu;
    stu.old=28;
    stu.score=98;
    printf("well struct xmphoenix\n");
#ifdef Debug
    printf("the student1 is old=%d\n",stu.old);
    printf("the student1 is score=%d\n",stu.score);
#endif
    ma master;
    ma *p;
    master.old=29;
    master.score=100;
    p=&master;
    printf("the student2 is old=%d\n",p->old);
    printf("the student2 is score=%d\n",p->score);
    p=NULL;

    doctor pt;
    pt=(doctor)malloc(sizeof(dor));
    pt->old=30;
    pt->score=100;
    printf("the student3 is old=%d\n",pt->old);
    printf("the student3 is score=%d\n",pt->score);
    free(pt);
    professor_p ppt;
    ppt=(professor_p)malloc(sizeof(prof));
    ppt->old=32;
    ppt->score=100;
    ppt->ma_p=&master;
    ppt->ma_p->old=100;
    ppt->ma_p->score=200;
    ppt->doc_p=(doctor)malloc(sizeof(dor));
    ppt->doc_p->old=200;
    ppt->doc_p->score=300;
    printf("prof is old =%d\n",ppt->old);
    printf("prof is score =%d\n",ppt->score);
    printf("master in prof is old =%d\n",ppt->ma_p->old);
    printf("master in prof is score =%d\n",ppt->ma_p->score);
    printf("doctor in prof is old =%d\n",ppt->doc_p->old);
    printf("doctor in prof is score =%d\n",ppt->doc_p->score);
    free(ppt->doc_p);
    free(ppt);
    return 0;       
}

編譯運行結果：