string类的成员函数
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#include <iostream>using namespace std;class String{public:String(const char* str =NULL);String(const String &another);~String();String& operator=(const String &rhs);void Print();protected:private:char* m_data;};String::String(const char* str /* =NULL */){if (str == NULL){m_data = new char[1];m_data[0] = '\0';}else{m_data = new char[strlen(str)+1];strcpy(m_data,str);}}String::String(const String &another){m_data = new char[strlen(another.m_data)+1];strcpy(m_data,another.m_data);}String::~String(){delete []m_data;}String& String::operator=(const String &rhs){if (this == &rhs)return *this;delete []m_data;m_data = new char[strlen(rhs.m_data)+1];strcpy(m_data,rhs.m_data);return *this;}void String::Print(){cout<<m_data<<endl;}void main(){String a("abcdefg");String b(a);String c=b;a.Print();b.Print();c.Print();}