Mystring类实现运算符重载

Mystring.h

#ifndef MYSTRING_H
#define MYSTRING_H
#include<iostream>
using namespace std;class Mystring
{
public:Mystring();Mystring(const char *s);Mystring(const Mystring &other);     //拷贝构造bool empty();                        //判空函数int  str_size();string c_str();char &at(int pos);Mystring & operator = (const Mystring &R);char &operator[](int n);Mystring operator+(const Mystring &R);Mystring& operator+=(const Mystring &R);bool operator==(const Mystring &R);bool operator!=(const Mystring &R);bool operator>(const Mystring &R);bool operator<(const Mystring &R);bool operator>=(const Mystring &R);bool operator<=(const Mystring &R);friend istream &operator>>(istream &L,const Mystring &R);friend ostream &operator<<(ostream &L ,const Mystring &R);~Mystring();
private:char *str;int size;
};

Mystring.cpp

#include "mystring.h"
#include<iostream>
#include<cstring>
using namespace std;
Mystring::Mystring():size(10)
{str = new char[size];strcpy(str," ");
}Mystring::Mystring(const char *s)
{size = strlen(s);str = new char[size+1];strcpy(str,s);
}Mystring::Mystring(const Mystring &other):size(other.size)
{str = new char[other.size];strcpy(str,other.str);
}bool Mystring::empty()
{return !strlen(str);
}int Mystring::str_size()
{return size;
}string Mystring::c_str()
{return this->str;
}char & Mystring::at(int pos)
{if(pos < 0 || pos >= size){throw std::out_of_range("Index out of range");}char &s = str[pos];return s;
}Mystring& Mystring::operator=(const Mystring &R)
{// 判断自我赋值if (this == &R)return *this;delete []str;Mystring temp;this->size = R.size;this->str = new char[size+1];strcpy(str,R.str);return *this;
}char & Mystring::operator[](int n)
{return str[n] ;
}Mystring Mystring::operator+(const Mystring &R)
{Mystring temp;temp.size = this->size + R.size -1;temp.str = new char[temp.size+1];strcpy(temp.str,this->str);strcat(temp.str,R.str);return temp;
}Mystring& Mystring::operator+=(const Mystring &R)
{size += R.size;Mystring temp;strcpy(temp.str,this->str);delete []this->str;this->str = new char[size+1];strcpy(this->str,temp.str);strcat(this->str,R.str);return *this;
}bool Mystring::operator==(const Mystring &R)
{return !strcmp(this->str,R.str);
}bool Mystring::operator!=(const Mystring &R)
{return strcmp(this->str,R.str);
}bool Mystring::operator>(const Mystring &R)
{return strcmp(this->str,R.str) > 0;
}
bool Mystring::operator<(const Mystring &R)
{return strcmp(this->str,R.str) < 0;
}bool Mystring::operator>=(const Mystring &R)
{return strcmp(this->str,R.str) >= 0;
}
bool Mystring::operator<=(const Mystring &R)
{return strcmp(this->str,R.str) <= 0;
}Mystring::~Mystring()
{delete []str;
}

main.cpp

#include <iostream>
#include "mystring.h"
#include<cstring>
using namespace std;
istream &operator>>(istream &L,const Mystring &R)
{L >> R.str;return L;
}
ostream &operator<<(ostream &L ,const Mystring &R)
{L << R.str << endl;return L;
}
int main()
{Mystring s1;Mystring s2("hello");Mystring s3(s2);cout << "s2 = " << s2.c_str() << endl;cout << "s3 = " << s3.c_str() << endl;cout << "s2.size = " << s2.str_size() << endl;for(int i = 0; i < s2.str_size(); i++){cout << s2.at(i) << endl;;}if(!s1.empty()){s1.at(0) = 'w';s1.at(1) = 'o';s1.at(2) = 'r';s1.at(3) = 'l';s1.at(4) = 'd';cout << "s1 = " << s1.c_str()<< endl;}cout << "s1 > s2 :" << (s1>s2) << endl;cout << "s1 < s2 :" << (s1<s2) << endl;cout << "s1 == s2 :" << (s1==s2) << endl;cout << "s2 == s3 :" << (s2 == s3) << endl;cout << "s2 != s3 :" << (s2 != s3) << endl;cout << "s2<= s3 :" << (s2 <= s3) << endl;cout << "s1>= s2 :" << (s1 >= s2) << endl;s3 = s2+s1;cout << "s3 :" << s3 << endl;cout << "s1 = :" << s1  << endl;s2 += s1;cout << "s2 :" << s2 << endl;cout << "s1 = :" << s1  << endl;s1 = s3;cout << "s1 = :" << s1  << endl;cout << "请输入s1的值：" << endl;cin >> s1;cout << "s1 = :" << s1 << endl;return 0;
}

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