CMyString

#include<iostream>
#include<string.h>
using namespace std;
class CMyString
{
    private:
    char *m_pStr;
    friend ostream &operator<<(ostream &os,CMyString &obj);
 friend CMyString operator +(const char *src,const CMyString &obj);
 friend int operator==(const char *src,CMyString &obj);
 friend istream &operator>>(istream &is,CMyString &obj);
    public:
 CMyString()  //默认构造
 {
  m_pStr = new char[1];
  *m_pStr = '\0';
 }
 CMyString(const char *src) //带参构造
 {
  m_pStr = new char[strlen(src)+1];
  strcpy(this->m_pStr, src);
  cout<<"CMyString(const char *src)"<<endl;
 }
 CMyString(CMyString &obj)
 {
  m_pStr=new char[strlen(obj.m_pStr)+1];
  strcpy(m_pStr,obj.m_pStr);
  cout<<"CMyString(CMyString &obj)"<<endl;
 }
    const char *operator=(const char *src)
    {
        delete []m_pStr;
        m_pStr=NULL;
        m_pStr=new char[strlen(src)+1];
        strcpy(m_pStr,src);
        cout<<"const char *oprator=(const char *src)"<<endl;
        return src;
    }
 CMyString &operator =(const CMyString &obj)
 {
  if(this==&obj)
  {
   return *this;
  }
  delete []m_pStr;
  m_pStr=NULL;
  m_pStr=new char [strlen(obj.m_pStr)+1];
  strcpy(m_pStr,obj.m_pStr);
  cout<<"CMyString &operator =(CMyString &obj)"<<endl;
  return *this;
 }
 size_t length()const
 {
  const char *p=this->m_pStr;
  while(*p++!='\0');
  return p-m_pStr-1;
 }
 CMyString operator+(const char *src)
 {
  CMyString newobj;
  delete newobj.m_pStr;
  newobj.m_pStr=new char[strlen(this->m_pStr)+strlen(src)+1];
  strcpy(newobj.m_pStr,m_pStr);
  strcat(newobj.m_pStr,src);
  cout<<"CMyString operator+(const char *src)"<<endl;
  return newobj;
 }
 CMyString operator+(const CMyString &obj)
 {
  CMyString newobj;
  delete newobj.m_pStr;
  newobj.m_pStr=new char[strlen(this->m_pStr)+strlen(obj.m_pStr)+1];
  strcpy(newobj.m_pStr,m_pStr);
  strcat(newobj.m_pStr,obj.m_pStr);
  cout<<"CMyString operator+(const CMyString &obj)"<<endl;
  return newobj;
 }
 int operator==(const char *src)
 {
  const char *p=this->m_pStr;
  while(*p==*src)
  {
   if(*p=='\0')
   {
    return 0;
   }
   p++;
   src++;
  }
  return (*p>*src)?1:-1;
 }
    ~CMyString()
    {
        delete []m_pStr;
        m_pStr=NULL;
    }

};
CMyString operator +(const char *src,const CMyString &obj)
{
 CMyString newobj;
 delete newobj.m_pStr;
 newobj.m_pStr=new char [strlen(src)+obj.length()+1];
 strcpy(newobj.m_pStr,src);
 strcat(newobj.m_pStr,obj.m_pStr);
 cout<<"CMyString operator +(const char *src,const CMyString &obj)"<<endl;
 return newobj;
}
int operator==(const char *src,CMyString &obj)
{
 return strcmp(src,obj.m_pStr);
}
ostream &operator<<(ostream &os,CMyString &obj)
{
    os<<obj.m_pStr;
    return os;
}
void GetString(char * &str)
{
 char c;
 static int nlength = 0;
 nlength++;
 if ((c = getchar()) == '\n') //判断输入字符结束
 {
  str = new char[nlength];
  c = '\0';
 }
 else
 {
  GetString(str);
 }
 str[--nlength] = c;
}
istream &operator>>(istream &is,CMyString &obj)
{
 delete []obj.m_pStr;
 GetString(obj.m_pStr);
 return is;
}
int main()
{
    CMyString str="111111";
    cout<<str<<endl;
    CMyString str1;
    str1="0000";
    cout<<str1<<endl;
 str1=str;
 cout<<str1<<endl;
 str1=str1+"22222";
 cout<<str1<<endl;
 str1=str1+str1;
 cout<<str1<<endl;
 str1="00000000"+str1;
 cout<<str1<<endl;
 str1="asdsadasd";
 cout<<(str1=="asdsadasc")<<endl;
 cout<<("asdsadasc"==str1)<<endl;
 cin>>str1;
 cout<<str1<<endl;
 system("pause");
    return 0;
}


 

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