C++ 指针引用

Posted 2020-07-25 庖丁解牛

//指针引用
#include<iostream>

using namespace std;

struct Teacher{
    char name[30];
    int age;
};

int InitA(Teacher **pout/*out*/){
    int ERRO_MSG = 0;
    if (pout==NULL)
    {
        ERRO_MSG = 1;
        printf("pout==NULL erro msg:%d\n", ERRO_MSG);
        return ERRO_MSG;
    }
    Teacher* ptemp = (Teacher*)malloc(sizeof(Teacher));
    if (ptemp == NULL)
    {
        ERRO_MSG = 2;
        printf("内存分配失败！ erro msg:%d\n", ERRO_MSG);
        return ERRO_MSG;
    }
    ptemp->age = 22;
    *pout = ptemp;
    return ERRO_MSG;
}

//指针引用
int InitB(Teacher* &pout){
    int ERRO_MSG = 0;
    pout = (Teacher*)malloc(sizeof(Teacher));
    if (pout == NULL)
    {
        ERRO_MSG = 2;
        printf("内存分配失败！ erro msg:%d\n", ERRO_MSG);
        return ERRO_MSG;
    }
    pout->age = 33;
    return ERRO_MSG;
}

void main(){
    Teacher *p = NULL;
    int ret = 0;
    //ret=InitA(&p);
    //if (ret!=0)
    //{
    //    printf("初始化Teacher失败！\n");
    //}
    //printf("教师A的年龄是%d\n",p->age);
    ret = InitB(p);
    if (ret != 0)
    {
        printf("初始化Teacher失败！\n");
    }
    printf("教师B的年龄是%d\n", p->age);
    system("pause");
}