等號重載的時候，一要記得先釋放舊的內存！！！！！！！！！總忘記

MyString.h

#pragma once #include<iostream> using namespace std; class MyString { public:MyString();MyString(char *p);MyString(const MyString &m1);~MyString();friend ostream &operator<<(ostream &out, MyString &t1);friend istream &operator>>(ostream &in, MyString &t2);MyString &operator=(MyString & t3);void printF();MyString &operator=(char * t3);char & MyString::operator[](int i);int operator>(MyString &t5); public:char *p;int length; };

　　MyString.cpp

#include "MyString.h" using namespace std;MyString::MyString() {length=0;this->p=new char [length +1]; }MyString::MyString(char *p) {if(this->p=NULL){this->length=0;this->p=NULL;}else{this->length=strlen(p);this->p=new char [length +1];strcpy(this->p,p);} } //MyString::MyString(char *p) //{ // if (this->p == NULL) // { // length = 0; // this->p = new char[length + 1]; // strcpy(this->p, ""); // } // else // { // this->length = strlen(p); // this->p = new char[length + 1]; // strcpy(this->p, p); // } //} MyString::MyString(const MyString &m1) {this->length=m1.length;this->p=new char [length +1];strcpy(this->p,m1.p); } MyString::~MyString() {if(p!=NULL){length=0;delete [] p;} } void MyString::printF() {cout<<this->p; }ostream & operator<<(ostream & out, MyString &t1) {out<<t1.p;return out; } istream &operator>>(istream &in, MyString &t2) {cin >> t2;//這句不理解啊return in; }//[] 的重載 cout<<a1<<endl; //a[i] char & MyString::operator[](int i) {return this->p[i]; } //等號的重載。a1=a2；a1=“sds”MyString &MyString::operator=(MyString & t3) {if(p!=NULL){delete [] p;length=0;}if(p=NULL){length=0;this->p=NULL;}else{this->length=t3.length;this->p=new char [length +1];strcpy(this->p,t3.p);}return *this;} //a1=“sds” MyString &MyString::operator=(char * t4) {if(p!=NULL){delete [] p;length=0;}if(p=NULL){length=0;this->p=NULL;}else{this->length=strlen(t4);this->p=new char[length +1];strcpy(p,t4);}return *this; }//a4>a1int MyString::operator>(MyString &t5){return strcmp(t5.p,this->p);}

　　main.cpp

#include<iostream> #include"MyString.h" using namespace std; //構造函數要求 //MyString a; //MyString a(“dddd”); //MyString b = a; // //常用的操作符 //<< >> != == > < =//cout<<a1<<endl;int main() { MyString a; MyString a1("dddd"); //需要重載<<操作符 //[] 的重載 cout<<a1<<endl;//MyString b=a; /*for(int i=0;i<a1.length;i++) { cout<<a1[i]<<" "; } */ MyString a4="fsfsdf"; a4[2]='2'; cout<<a4[2]; cout<<a4;if(a4>a1) { cout<<"ok"; }system("pause");}

　　

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轉載于:https://www.cnblogs.com/xiaochige/p/6603357.html

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