#include<iostream> using namespace std;class String{friend ostream& operator<< (ostream&,String&); public:String(const char* str=NULL); //賦值構造兼默認構造函數(char)String(const String &other); //賦值構造函數(String)String& operator=(const String&other); //operator=String operator+(const String &other)const; //operator+bool operator==(const String&); //operator==char& operator[](unsigned int); //operator[]size_t size(){return strlen(m_data);};~String(void) {delete[] m_data;} private:char *m_data; }; inline String::String(const char* str) {if (!str) m_data=0;else{m_data = new char[strlen(str)+1];strcpy(m_data,str);} } inline String::String(const String& other) {if(!other.m_data) m_data=0;else{m_data=new char[strlen(other.m_data)+1];strcpy(m_data,other.m_data);} } inline String& String::operator=(const String& other) {if (this!=&other){delete[] m_data;if(!other.m_data) m_data=0;else{m_data = new char[strlen(other.m_data)+1];strcpy(m_data,other.m_data);}}return *this; } inline String String::operator+(const String &other)const {String newString;if(!other.m_data)newString = *this;else if(!m_data)newString = other;else{newString.m_data = new char[strlen(m_data)+strlen(other.m_data)+1];strcpy(newString.m_data,m_data);strcat(newString.m_data,other.m_data);}return newString; } inline bool String::operator==(const String &s) {if ( strlen(s.m_data) != strlen(m_data) )return false;return strcmp(m_data,s.m_data)?false:true; } inline char& String::operator[](unsigned int e) {if (e>=0&&e<=strlen(m_data))return m_data[e]; } ostream& operator<<(ostream& os,String& str) {os << str.m_data;return os; } void main() {String str1="Hello!";String str2="Teacher!";String str3 = str1+str2;cout<<str3<<"\n"<<str3.size()<<endl;cin.ignore(100, '\n');cin.get(); }

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