c++问题 - 编程论坛

#2

f23782009-09-24 22:32

char *L_UserName;
char *L_UserPassword;

在构造函数先初始化指针吧

#3

xiaohui2402009-09-25 16:02

# include<iostream>
using namespace std;

class CUser{
private:
        char *L_UserName;
        char *L_UserPassword;
public:
       CUser(){
//           strcpy(this->L_UserName,"SUNKAI");
//           strcpy(this->L_UserPassword,"123");
           L_UserName = "SUNKAI";
           L_UserPassword = "123";
       }
       char *GetUserName()const{
           return L_UserName;
       }
       char *GetUserPassword()const{
           return L_UserPassword;
       }
};

void main(){
    CUser user;
    cout<<user.GetUserName()<<endl;
    cout<<user.GetUserPassword()<<endl;
}

#4

haitao99992009-09-26 14:38

L_UserName和L_UserPassword指针在使用前必须申请内存，否则在赋值时没有存放位置。修改后代码如下：
#include<iostream>
using namespace std;

class CUser{
private:
        char *L_UserName;
        char *L_UserPassword;
public:
       CUser(){
           L_UserName = new char[100];
           L_UserPassword = new char[100];
            strcpy(this->L_UserName,"SUNKAI");
            strcpy(this->L_UserPassword,"123");
       }
       char *GetUserName()const{
            return L_UserName;
       }
       char *GetUserPassword()const{
            return L_UserPassword;
       }
};

int main(){
     CUser user;
     cout<<user.GetUserName()<<endl;
     cout<<user.GetUserPassword()<<endl;
}

#5

飞天的猪2009-09-28 13:33

不用申请内存也行，指针是顺序存放的

#6

wen111hui2009-09-28 22:18

顶

#7

小兰012009-09-29 11:22

换个工作空间试试看．

#8

taozztzz2009-09-29 14:20

以下是引用飞天的猪在2009-9-28 13:33:49的发言：

不用申请内存也行，指针是顺序存放的

谁跟你说可以不申请内存的？当然要申请！
用四楼的可以解决问题，但是要加一个析构函数：

CUser::~CUser()
{
delete [] L_UserName;
delete [] L_UserPassword;
}

否则会发生内存泄露！