c 结构体 & 函数指针模拟实现一个java class(类) 和方法

闲来无事，纯粹练习。

student.h

#ifndef STUDENT_H_INCLUDED

#define STUDENT_H_INCLUDED

#include <memory.h>

#include <stdlib.h>

typedef struct _Student

{

    char name[];

    int sx; //数学

    int yw; //语文

    int yy; //英语

    int wl; //物理

    int hx; //化学

    int sw; //生物

    int (*avg)(struct _Student *); // 所有分数的加起来的平均分

    int (*avg2)(struct _Student *); //数学, 语文, 英文加起来的平均分

} Student, *lpStudent;

Student *student_init(); //初始化

#endif // STUDENT_H_INCLUDED

student.c

#include "student.h"

// 所有分数的加起来的平均分

int avg(struct _Student *lpSelf)

{

    return (lpSelf->sx + lpSelf->yw + lpSelf->yy + lpSelf->wl + lpSelf->hx + lpSelf->sw) / ;

}

//数学, 语文, 英文加起来的平均分

int avg2(struct _Student *lpSelf)

{

    return (lpSelf->sx + lpSelf->yw + lpSelf->yy) / ;

}

//初始化

Student *student_init()

{

    lpStudent lpStdt = (lpStudent) malloc(sizeof(Student));

    memset(lpStdt, '\0', sizeof(Student));

    lpStdt->avg = avg;

    lpStdt->avg2 = avg2;

    return lpStdt;

}

test.c

int main(int argc, char *argv[])

{

    Student *lpStdt = student_init();

    lpStdt->sx = ;

    lpStdt->yw = ;

    lpStdt->yy = ;

    lpStdt->wl = ;

    lpStdt->hx = ;

    lpStdt->sw = ;

    printf(" avg:%d\n", lpStdt->avg(lpStdt));

    printf("avg2:%d\n", lpStdt->avg2(lpStdt));

    return ;

}

输出的结果：

avg:35
avg2:20