Breaking News: Grepper is joining You.com. Read the official announcement!

C++ Copy Constructor vs not Copy Constructor

VARAK-VURAK answered on October 4, 2022 Popularity 3/10 Helpfulness 1/10

answer C++ Copy Constructor vs not Copy Constructor

C++ Copy Constructor vs not Copy Constructor

Comment

// C++ program to demonstrate the 
// Working of Copy constructor
#include <cstring>
#include <iostream>
using namespace std;
  
class String {
private:
    char* s;
    int size;
  
public:
    String(const char* str = NULL); // constructor
    ~String() { delete[] s; } // destructor
    String(const String&); // copy constructor
    void print()
    {
        cout << s << endl;
    } // Function to print string
    void change(const char*); // Function to change
};
  
// In this the pointer returns the CHAR ARRAY
// in the same sequence of string object but
// with an additional null pointer '\0' 
String::String(const char* str)
{
    size = strlen(str);
    s = new char[size + 1];
    strcpy(s, str);
}
  
  
void String::change(const char* str)
{
    delete[] s;
    size = strlen(str);
    s = new char[size + 1];
    strcpy(s, str);
}
  
String::String(const String& old_str)
{
    size = old_str.size;
    s = new char[size + 1];
    strcpy(s, old_str.s);
}
  
int main()
{
    String str1("GeeksQuiz");
    String str2 = str1;
  
    str1.print(); // what is printed ?
    str2.print();
  
    str2.change("GeeksforGeeks");
  
    str1.print(); // what is printed now ?
    str2.print();
    return 0;
}

/*
GeeksQuiz
GeeksQuiz
GeeksQuiz
GeeksforGeeks
*/
/////////////////////////////////
#include<iostream>
#include<cstring>
using namespace std;

class String
{
private:
	char *s;
	int size;
public:
	String(const char *str = NULL); // constructor
	~String() { delete [] s; }// destructor
	void print() { cout << s << endl; }
	void change(const char *); // Function to change
};

String::String(const char *str)
{
	size = strlen(str);
	s = new char[size+1];
	strcpy(s, str);
}

// In this the pointer returns the CHAR ARRAY
// in the same sequence of string object but
// with an additional null pointer '\0'
void String::change(const char *str)
{
	delete [] s;
	size = strlen(str);
	s = new char[size+1];
	strcpy(s, str);
}

int main()
{
	String str1("GeeksQuiz");
	String str2 = str1;

	str1.print(); // what is printed ?
	str2.print();

	str2.change("GeeksforGeeks");

	str1.print(); // what is printed now ?
	str2.print();
	return 0;
}

/*
GeeksQuiz
GeeksQuiz
GeeksforGeeks
GeeksforGeeks
*/

Popularity 3/10 Helpfulness 1/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++ copy-constructor

Link to this answer
Share Copy Link

Contributed on Oct 04 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

C++ Copy Constructor vs not Copy Constructor

Contents

More Related Answers

C++ Copy Constructor vs not Copy Constructor

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.