mystring.h

#ifndef _MYSTRING_H_ #define _MYSTRING_H_#include <iostream> using namespace std; class Mystring {//<< >> 全局函數friend istream & operator >> (istream &in ,Mystring & s1); // 重載 >>friend ostream & operator << (ostream &out, const Mystring & s1); //重載 <<private:char *m_data;int m_len;void init(); public:Mystring();Mystring(char *str);Mystring(int l, char ch);Mystring(const Mystring &s);Mystring & operator =( Mystring &s);Mystring & operator +=(Mystring &s);char & operator [](int index); }; #endif

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mystring.cpp

#include "mystring.h" #include <string.h> #include <iostream> #pragma warning(disable:4996)using namespace std;void Mystring::init() {m_len = 1;m_data = new char[m_len+1]; }Mystring::Mystring() {init(); }Mystring::Mystring(char *str) {m_len = strlen(str);m_data = new char[m_len + 1];//注意+1strcpy(this->m_data, str); }Mystring::Mystring(int l, char ch) {m_len = l;m_data = new char[m_len + 1];for (int i = 0; i < l; i++){m_data[i] = ch;}m_data[l] = '\0';//!!!!!!!!!!!!!!!!!!!!!!!!!! }Mystring::Mystring(const Mystring &s) {this->m_len = s.m_len;m_data = new char[m_len + 1];//!!!!!!!!!!!!strcpy(this->m_data ?, s.m_data); }istream & operator >>(istream &in,Mystring &s)//重載 >> {char tmp[1024] = {0};in >> tmp;if (s.m_data != NULL){delete s.m_data;}s.m_len = strlen(tmp);s.m_data = new char[s.m_len + 1];//注意+1strcpy(s.m_data, tmp);return in; }ostream & operator << (ostream &out, const Mystring &s1)//重載 << {out << s1.m_data;return out; }Mystring& Mystring::operator =(Mystring &s)//重載 >> {m_len = s.m_len;if (m_data != NULL){delete m_data;}m_data = new char[s.m_len + 1];//注意+1strcpy(m_data, s.m_data);return *this; }Mystring & Mystring::operator +=(Mystring &s) {m_len = m_len + s.m_len;char *tmp = new char [m_len + 1];strcpy(tmp, m_data);strcat(tmp,s.m_data);delete m_data;m_data = tmp;return *this; }char & Mystring::operator [](int index) {return m_data[index]; }

main.cpp

#include <iostream> #include "mystring.h"using namespace std;int main() {Mystring s1;Mystring s2("hello");Mystring s3(10, 'a');Mystring s4 = s2;Mystring s5(s2);cin >> s1;cout << "s1 = " << s1 << endl;cout << "s2 = " << s2 << endl;cout << "s3 = " << s3 << endl;cout << "s4 = " << s4 << endl;cout << "s5 = " << s5 << endl;s1 += s2;cout << s1 << endl;cout << s1[0] << endl;s1[1] = '1';cout << s1 << endl;system("pause");return 0; }

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