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[16];

    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) / 6;
}

//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) / 3;
}

//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 = 10;
    lpStdt->yw = 20;
    lpStdt->yy = 30;
    lpStdt->wl = 40;
    lpStdt->hx = 50;
    lpStdt->sw = 60;

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

    return 0;
}

 

输出的结果：

avg:35
avg2:20