Answer to Question #281464 in C++ for jye

Question

Construct the String class to describe a string of characters, with the following functions:

constructor, destructor, copy constructor, assignment operator function

Define operator to add two strings (concatenate two strings)

Functions that define comparison operations !=,==,>,>=,<,<=

Define input and output operators for a string

Functions that allow to assign/get (write/read) the value of a certain element in the Array

Write a main program using the above String class

Answer 1

#include<iostream>
#include<string>


using namespace std;


class String{
private:
	string characters;//string of characters 
public:
	String(){}
	//constructor
	String(string characters) {
		this->characters = characters;
	}
	//copy constructor
	String(String& stringOther) {
		this->characters = stringOther.characters;
	}
	//destructor
	~String(){}
	//assignment operator function
	String operator=(String & stringOther)
	{
		this->characters=stringOther.characters;
		return *this;
	}
	//Define operator to add two strings (concatenate two strings)
	String operator+(String & stringOther)
	{
		return this->characters+stringOther.characters;
	}
	//Functions that define comparison operations !=,==,>,>=,<,<=
	bool operator==(const String& rhs) const { 
		return this->characters == rhs.characters; 
	}
	bool operator!=(const String& rhs) const { 
		return !(*this == rhs);    
	}
	bool operator<=(const String& rhs) const { 
		return !(rhs < *this);     
	}
	bool operator>(const String& rhs)  const { 
		return rhs < *this;        
	}
	bool operator<(const String& rhs)  const { 
		return rhs.characters.compare(this->characters)<0;        
	}
	bool operator>=(const String& rhs) const {   
		return !(*this < rhs);     
	}
	//Define input and output operators for a string
	friend ostream& operator<<(ostream& os,const String &str){
		os <<str.characters;
		return os;
	}
	//Functions that allow to assign/get (write/read) the value of a certain element in the Array
	friend istream& operator>>(istream & strIstream, String &str){
		getline(strIstream,str.characters);
		return strIstream;
	}


};


int main(){
	//Write a main program using the above String class
	String string1;
	String string2;
	cout<<"Enter the string 1: ";
	cin>>string1;
	cout<<"Enter the string 2: ";
	cin>>string2;


	cout<<"\nThe string 1: "<<string1;
	cout<<"\nThe string 2: "<<string2<<"\n\n";




	cout<<"(string1>string2): "<<(string1>string2)<<"\n";
	cout<<"(string1<string2): "<<(string1<string2)<<"\n";
	cout<<"(string1!=string2): "<<(string1!=string2)<<"\n";
	cout<<"(string1==string2): "<<(string1==string2)<<"\n";
	cout<<"(string1>=string2): "<<(string1>=string2)<<"\n";
	cout<<"(string1<=string2): "<<(string1<=string2)<<"\n";
	cout<<"(string1+string2): "<<(string1+string2)<<"\n";






	system("pause");


	return 0;
}