mystring.h
1 #pragma once 2 3 class mystring 4 { 5 public: 6 mystring( const char *str=NULL); 7 mystring(const mystring &others); 8 9 mystring &operator = (const mystring & others); 10 virtual ~mystring(void); 11 12 void disply(); 13 14 private: 15 char *m_data; 16 17 18 };
mystring.cpp
1 mystring::mystring( const char *str/*=NULL*/ ) 2 { 3 4 m_data = new char [strlen(str)+1]; 5 6 7 if(!m_data) 8 { 9 10 return ; 11 } 12 13 strcpy(m_data,str); 14 15 } 16 17 mystring::mystring( const mystring &others ) 18 { 19 20 m_data = new char [strlen(others.m_data)+1]; 21 22 23 if(!m_data) 24 { 25 26 return ; 27 } 28 29 strcpy(m_data,others.m_data); 30 } 31 32 mystring::~mystring(void) 33 { 34 35 if(m_data) 36 { 37 delete [] m_data; 38 m_data = NULL; 39 } 40 } 41 42 void mystring::disply() 43 { 44 45 cout<<m_data<<endl; 46 } 47 48 mystring & mystring::operator=( const mystring & others ) 49 { 50 51 if(this== &others) 52 { 53 return *this; 54 } 55 56 57 if(m_data!=NULL) 58 { 59 delete []m_data; 60 } 61 62 m_data = new char [strlen(others.m_data)+1]; 63 strcpy(m_data,others.m_data); 64 return *this; 65 66 } 67 68 69 int _tmain() 70 71 { 72 73 74 mystring s("sdaadssa"); 75 76 mystring p("dasda"); 77 78 s = p; 79 80 s.disply(); 81 return 0; 82 83 }