学步园

#ifndef WYZ_1
#define WYZ_1
#include<iostream>
#include<string>
class point
{
private:
 int nsize,asize;
 char*  name;
 char* account;
 double saving;
public:
 point();
 point(char*,char*,double);
 point(std::string &,std::string &,double);
 point::point(const point& bank);
 point& operator=(const point& bank);
 

  void funsaving(double){ saving=dsaving;}
 friend std::ostream& operator<<(std::ostream &os,const point & bank);
 ~point();
};
#endif

//.................................................................................................................................

#include"110.h"

#include<cstdio>
point::point()
{
        asize=nsize=4;
     name=new char[nsize];
  strncpy(name,"***",nsize);
 
  account=new char[asize];
 strncpy(account,"***",asize);

  saving=0;
 }
point::point(char *strname,char* straccount,double dsaving)
{
 nsize=strlen(strname);
 name=new char[nsize+1];
 strcpy(name,strname);

    asize=strlen(straccount);
 account=new char[asize+1];
 strcpy(account,straccount);

 saving=dsaving;
}
point::point(std::string &strname,std::string &straccount,double dsaving)
{
 nsize=strname.size();
    name=new char[nsize+1];
 strcpy(name,strname.c_str());
 asize=straccount.size();
 account=new char[asize+1];
 strcpy(account,straccount.c_str());
 saving=dsaving;
}
point& point::operator=(const point& bank)
{ 

  if(this==&bank)

        return *this;

  delete[] bank;
  nsize=bank.nsize;
  name=new char[nsize+1];
  std::strcpy(name,bank.name);
  asize=bank.asize;
  account=new char[asize+1];
  std::strcpy(account,bank.account);
  saving=bank.saving;
     return *this;
 }
point::point(const point& bank)
{
     nsize=bank.nsize;
  name=new char[nsize+1];
  std::strcpy(name,bank.name);
  asize=bank.asize;
  account=new char[asize+1];
  std::strcpy(account,bank.account);
  saving=bank.saving;
}

point::~point()
{
 delete[]account;
 delete[]name;
}
 std::ostream& operator<<(std::ostream& os,const point& bank)
{
 os<<"姓名:"<<bank.name<<std::endl<<"帐号:"<<bank.account<<std::endl<<"余额:"<<bank.saving<<std::endl;
 return os;
}

//.............................................................................................................................................................................

#include<iostream>
#include<string>
#include"110.h"
int main()
{
 using namespace std;
 cout.setf(ios_base::fixed,ios_base::floatfield);
 cout.precision(4);
    string name,account;
 double saving;
    getline(cin,name);
 getline(cin,account);
 cin>>saving;
    point wqn(name,account,saving),qan;
 cout<<wqn<<endl<<qan;
 cin>>saving;
 wqn.funsaving(saving);
 cout<<wqn;
    cout<<"另一个"<<endl;
 point stg=point("qwer","utryuyytr",456.123);
 cout<<stg<<endl<<endl;
 wqn=stg;
 cout<<stg;
 return 0;
}

 

我刚开始学c++。望师兄们指点。