You are asked to implement the following “C++ strings” class Here is the class i

Question

You are asked to implement the following “C++ strings” class Here is the class interface and an example main program: #include <string> #include <iostream> using namespace std; class StringList { public: StringList(); // Creates a new, empty, list StringList(string init[], int size); // Creates a new list, initialized from the given values StringList(const StringList& other); // Copy constructor void addEntry(string str); // Adds a string to the list void displayAllEntry () const; // Diaplay all strings from the list int countEntry() const; // Returns the number of strings in the list string get(int idx) const; // Returns the string at the given index void set(int idx, string str); // Sets the string at the given index ~StringList(); // Destroys the list, releasing any allocated memory void operator=(const StringList& right_side); // Assignment operator private: string *list; int size; }; int main() { // Make an array and put some names in it int init_names_size = 5; string init_names[init_names_size]; init_names[0] = "Ahmad"; init_names[1] = "Wiggum"; init_names[2] = "Natasha"; init_names[3] = "Layla"; // Make two lists, one with each constructor StringList names(init_names, 5), list; cout << "Initial list:" << endl; names.displayAllEntry(); // Add and remove some names names.addEntry("Iyad"); cout << "After adding a name:" << endl; names.displayAllEntry(); names.addEntry("Muntz"); cout << "After adding another name:" << endl; names.displayAllEntry(); names.addEntry("Burns"); names.addEntry("Sameer"); cout << "After adding three names:" << endl; names.displayAllEntry(); cout << endl << "An empty list created with the default constructor:" << endl; list.displayAllEntry(); list.addEntry("Milhouse"); list.addEntry("Hind"); cout << "After adding two entries:" << endl; list.displayAllEntry(); list.set(0, "Jimbo"); cout << "After changing the first entry:" << endl; list.displayAllEntry(); cout << endl << "After assigning first list to the second list: " << endl; list = names; list.displayAllEntry(); cout << "First list (again): " << endl; names.displayAllEntry(); cout << endl << "A third list, created with the copy constructor: " << endl; StringList list_copy(list); list_copy.displayAllEntry(); return 0; } You are asked to implement the following “C++ strings” class Here is the class interface and an example main program: #include <string> #include <iostream> using namespace std; class StringList { public: StringList(); // Creates a new, empty, list StringList(string init[], int size); // Creates a new list, initialized from the given values StringList(const StringList& other); // Copy constructor void addEntry(string str); // Adds a string to the list void displayAllEntry () const; // Diaplay all strings from the list int countEntry() const; // Returns the number of strings in the list string get(int idx) const; // Returns the string at the given index void set(int idx, string str); // Sets the string at the given index ~StringList(); // Destroys the list, releasing any allocated memory void operator=(const StringList& right_side); // Assignment operator private: string *list; int size; }; int main() { // Make an array and put some names in it int init_names_size = 5; string init_names[init_names_size]; init_names[0] = "Ahmad"; init_names[1] = "Wiggum"; init_names[2] = "Natasha"; init_names[3] = "Layla"; // Make two lists, one with each constructor StringList names(init_names, 5), list; cout << "Initial list:" << endl; names.displayAllEntry(); // Add and remove some names names.addEntry("Iyad"); cout << "After adding a name:" << endl; names.displayAllEntry(); names.addEntry("Muntz"); cout << "After adding another name:" << endl; names.displayAllEntry(); names.addEntry("Burns"); names.addEntry("Sameer"); cout << "After adding three names:" << endl; names.displayAllEntry(); cout << endl << "An empty list created with the default constructor:" << endl; list.displayAllEntry(); list.addEntry("Milhouse"); list.addEntry("Hind"); cout << "After adding two entries:" << endl; list.displayAllEntry(); list.set(0, "Jimbo"); cout << "After changing the first entry:" << endl; list.displayAllEntry(); cout << endl << "After assigning first list to the second list: " << endl; list = names; list.displayAllEntry(); cout << "First list (again): " << endl; names.displayAllEntry(); cout << endl << "A third list, created with the copy constructor: " << endl; StringList list_copy(list); list_copy.displayAllEntry(); return 0; } You are asked to implement the following “C++ strings” class Here is the class interface and an example main program: #include <string> #include <iostream> using namespace std; class StringList { public: StringList(); // Creates a new, empty, list StringList(string init[], int size); // Creates a new list, initialized from the given values StringList(const StringList& other); // Copy constructor void addEntry(string str); // Adds a string to the list void displayAllEntry () const; // Diaplay all strings from the list int countEntry() const; // Returns the number of strings in the list string get(int idx) const; // Returns the string at the given index void set(int idx, string str); // Sets the string at the given index ~StringList(); // Destroys the list, releasing any allocated memory void operator=(const StringList& right_side); // Assignment operator private: string *list; int size; }; int main() { // Make an array and put some names in it int init_names_size = 5; string init_names[init_names_size]; init_names[0] = "Ahmad"; init_names[1] = "Wiggum"; init_names[2] = "Natasha"; init_names[3] = "Layla"; // Make two lists, one with each constructor StringList names(init_names, 5), list; cout << "Initial list:" << endl; names.displayAllEntry(); // Add and remove some names names.addEntry("Iyad"); cout << "After adding a name:" << endl; names.displayAllEntry(); names.addEntry("Muntz"); cout << "After adding another name:" << endl; names.displayAllEntry(); names.addEntry("Burns"); names.addEntry("Sameer"); cout << "After adding three names:" << endl; names.displayAllEntry(); cout << endl << "An empty list created with the default constructor:" << endl; list.displayAllEntry(); list.addEntry("Milhouse"); list.addEntry("Hind"); cout << "After adding two entries:" << endl; list.displayAllEntry(); list.set(0, "Jimbo"); cout << "After changing the first entry:" << endl; list.displayAllEntry(); cout << endl << "After assigning first list to the second list: " << endl; list = names; list.displayAllEntry(); cout << "First list (again): " << endl; names.displayAllEntry(); cout << endl << "A third list, created with the copy constructor: " << endl; StringList list_copy(list); list_copy.displayAllEntry(); return 0; }

Explanation / Answer

#include <string>

#include <iostream>

using namespace std;

class StringList

{

public:

StringList();

// Creates a new, empty, list

StringList(string init[], int size);

// Creates a new list, initialized from the given values

StringList(const StringList& other);

// Copy constructor

void addEntry(string str);

// Adds a string to the list

void displayAllEntry () const;

// Diaplay all strings from the list

int countEntry() const;

// Returns the number of strings in the list

string get(int idx) const;

// Returns the string at the given index

void set(int idx, string str);

// Sets the string at the given index

~StringList();

// Destroys the list, releasing any allocated memory

void operator=(const StringList& right_side);

// Assignment operator

private:

string *list;

int size;

};

int main()

{

// Make an array and put some names in it

int init_names_size = 5;

string init_names[init_names_size];

init_names[0] = "Ahmad";

init_names[1] = "Wiggum";

init_names[2] = "Natasha";

init_names[3] = "Layla";

// Make two lists, one with each constructor

StringList names(init_names, 5), list;

cout << "Initial list:" << endl;

names.displayAllEntry();

// Add and remove some names

names.addEntry("Iyad");

cout << "After adding a name:" << endl;

names.displayAllEntry();

names.addEntry("Muntz");

cout << "After adding another name:" << endl;

names.displayAllEntry();

names.addEntry("Burns");

names.addEntry("Sameer");

cout << "After adding three names:" << endl;

names.displayAllEntry();

cout << endl << "An empty list created with the default constructor:"

<< endl;

list.displayAllEntry();

list.addEntry("Milhouse");

list.addEntry("Hind");

cout << "After adding two entries:" << endl;

list.displayAllEntry();

list.set(0, "Jimbo");

cout << "After changing the first entry:" << endl;

list.displayAllEntry();

cout << endl << "After assigning first list to the second list: " << endl;

list = names;

list.displayAllEntry();

cout << "First list (again): " << endl;

names.displayAllEntry();

cout << endl << "A third list, created with the copy constructor: " << endl;

StringList list_copy(list);

list_copy.displayAllEntry();

return 0;

}

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