Question

#include <cstring>       // for strlen()
#include <cassert>       // for assert()
#include <iostream>       // for cout

using namespace std;

class MyString
{
   private:
       char *m_data;
       int m_length;

   public:
       MyString(const char *source = "")
       {
           assert(source); // make sure source isn't a null string

           // Find the length of the string
           // Plus one character for a terminator
           m_length = strlen(source) + 1;
  
           // Allocate a buffer equal to this length
           m_data = new char[m_length];
  
           // Copy the parameter string into our internal buffer
           for (int i = 0; i < m_length; ++i)
               m_data[i] = source[i];
  
           // Make sure the string is terminated
           m_data[m_length-1] = '\0';
       }
  

// 1. Your copy constructor code goes here

// 2. Your assignment operator code goes here

  

// 3. Your overloaded operator<< code goes here

~MyString()        // destructor
{
// We need to deallocate our string
delete[] m_data;
}

char* getString() { return m_data; }
int getLength() { return m_length; }
};

int main()
{

   char* testOutput = "Test String Here";
   MyString original(testOutput);   
   cout << "\n original object holds string : " << original << endl;

   char* newOutput = "copied successfully using copy constructor!";
   MyString notOriginal(newOutput);
   cout << "\n notOriginal object holds string: " << notOriginal << endl;
  
   cout << "\n Now, let's copy notOriginal object to displayCopiedString object " << endl;
   // notOriginal is an object, not a char*
   MyString displayCopiedString (notOriginal);   
   cout << "\n displayCopiedString: " << displayCopiedString << "as well" << endl;

}

Answer 1

//Modified C program

#include <cstring> // for strlen()
#include <cassert> // for assert()
#include <iostream> // for cout

using namespace std;

class MyString
{
private:
char *m_data;
int m_length;

public:
MyString(const char *source = "")
{
assert(source); // make sure source isn't a null string

// Find the length of the string
// Plus one character for a terminator
m_length = strlen(source) + 1;
  
// Allocate a buffer equal to this length
m_data = new char[m_length];
  
// Copy the parameter string into our internal buffer
for (int i = 0; i < m_length; ++i)
m_data[i] = source[i];
  
// Make sure the string is terminated
m_data[m_length-1] = '\0';
}
  

// 1. Your copy constructor code goes here

MyString(const MyString & str){
   m_length = str.m_length;
  
// Allocate a buffer equal to this length
m_data = new char[m_length];
  
// Copy the parameter string into our internal buffer
for (int i = 0; i < m_length; ++i)
m_data[i] = str.m_data[i];
  
// Make sure the string is terminated
m_data[m_length-1] = '\0';
}

// 2. Your assignment operator code goes here
MyString & operator =(const MyString & str){
   MyString ob;
   ob.m_length = str.m_length;
  
// Allocate a buffer equal to this length
ob.m_data = new char[m_length];
  
// Copy the parameter string into our internal buffer
for (int i = 0; i < ob.m_length; ++i)
ob.m_data[i] = str.m_data[i];
  
// Make sure the string is terminated
ob.m_data[ob.m_length-1] = '\0';
return ob;
}
  

// 3. Your overloaded operator<< code goes here

friend ostream& operator <<(ostream&os,const MyString&str){
   for (int i = 0; i < str.m_length; ++i)
           os<<str.m_data[i];
           return os;
   }

~MyString() // destructor
{
// We need to deallocate our string
delete[] m_data;
}

char* getString() { return m_data; }
int getLength() { return m_length; }
};

int main()
{

char* testOutput = "Test String Here";
MyString original(testOutput);   
cout << "\n original object holds string : " <<original << endl;

char* newOutput = "copied successfully using copy constructor!";
MyString notOriginal(newOutput);
cout << "\n notOriginal object holds string: " << notOriginal << endl;
  
cout << "\n Now, let's copy notOriginal object to displayCopiedString object " << endl;
// notOriginal is an object, not a char*
MyString displayCopiedString (notOriginal);   
cout << "\n displayCopiedString: " << displayCopiedString << "as well" << endl;

}

//sample output