Program is stopped

[BishoyGabriel]

Hello everyone
My program stops working when working in 'Adding an item'. Program stops working. Would someone help me with this please ?

//*********************************
// Libraries used for the program
//*********************************
#include <iostream>
#include <string>
#include <iomanip>
#include <cmath>
#include <cstdlib>

using namespace std;

//*********************************
// Linked list Structure for Movie
//*********************************
struct movie_node
{
string movie_name;
string cast_name[3];
string movie_genre;
int movie_rate;

movie_node* link;
};

//*****************************
// Main body of the program
//*****************************
int main ()
{
int choice, choice1;
string name, label, label1, cast_movies[3], choice2;

movie_node* nodeptr, *before_nodeptr;
movie_node* head;
head = new movie_node;

//*****************************************************
// Do-while loop to satisfy options from the Main Menu
//*****************************************************
do {

cout << " MAIN MENU :- "<< endl;
cout << endl;
cout << " 1) Removing an item. " << endl;
cout << " 2) Adding an item. " << endl;
cout << " 3) Displaying an item. " << endl;
cout << " 4) Searching an item. " << endl;
cout << " 5) Exit the program. " << endl;
cout << endl;

cout << " Enter your option out of these 5 options please : " << endl;
cin >> choice;

//***************************************************
// If condition to satisfy option number 1 from the Main Menu.
// Removing an item.
//***************************************************
if(choice == 1)
{

cout << " Enter the name of the movie/movies you want to remove ? " << endl;
cin >> name;

//***************************************************
// If condition to show if the list is empty or not.
//***************************************************
if (!head)
{
cout << " Empty list ! " << endl;
return -1;
}

//**************************************************************************
// If condition to check if the first node is the one to be deleted or not.
//**************************************************************************
if (head->movie_name == name)
{
nodeptr = head;
head = head->link;
delete nodeptr;
}

else
{
//*************************************************
// nodeptr is initialized to the head of the list.
//*************************************************
nodeptr = head;

while (nodeptr != NULL && nodeptr->movie_name != name)

before_nodeptr = nodeptr;
nodeptr = nodeptr->link;
}

if (nodeptr)
{

before_nodeptr-> link = nodeptr-> link;
delete nodeptr;

cout << " .............End............. " << endl;
}
}

//***************************************************
// Else if condition to satisfy option number 2 from the Main Menu.
// Adding an item.
//***************************************************
else if (choice == 2)
{
//***************************************
// Entering the name of the movie.
//***************************************
head = new movie_node;
cout << " Please enter the name of the movie you want to add or press '-5' to EXIT the program " << endl;
cin >> label;

if(label == "-5")
break;

//***************************************
// Entering the genre of the movie.
//***************************************
cout << " Enter your genre choice of the following genres:" << endl;
cout << " 1. ACTION " << endl;
cout << " 2. COMEDY " << endl;
cout << " 3. DRAMA " << endl;
cout << " 4. HORROR " << endl;
cout << " 5. MARTIAL ARTS " << endl;
cout << " 6. ROMANCE " << endl;
cout << " 7. SCIENCE FICTION " << endl;
cout << " 8. SUPER NATURAL " << endl;

cin >> choice2;
cout << endl;
cout << endl;

//******************************************
// Entering the actor names of the movie.
//****************************************
cout << " Enter 3 names of actors from this movie " << endl;
for (int a = 0; a < 3; a++)
{
cin >> cast_movies[a];
cout << endl;
cout << endl;
}

//***************************************
// Entering the movie rating.
//***************************************
cout << " Enter the movie rating:- 1, 2, 3, 4 or 5 stars " << endl;
cin >> choice1;
cout << endl;
cout << endl;

if (choice1 < 1 || choice1 >5)
{
cout << " Please re-enter 1, 2, 3, 4, or 5:" << endl;
cin >> choice1;
cout << endl;
}

if (head == NULL)
{

for (int a = 0; a < 3; a++)
head->cast_name[a] = cast_movies[a];

head-> movie_genre = choice2;
head-> movie_name = label;
head-> movie_rate = choice1;
}

else
{
movie_node* node = head;
while (node->link != NULL)

{
node = node-> link;
}
node = new movie_node;

for ( int a = 0; a < 3; a++)
node->cast_name[a] = cast_movies[a];

node->movie_genre = choice2;
node->movie_name = label;
node->movie_rate = choice1;
}
}

//***************************************************
// Else if condition to satisfy option number 3 from the Main Menu.
// Displaying an item.
//***************************************************
else if (choice == 3)
{
movie_node *current;
if (!head)
{
cout << " Empty list ! " << endl;
return-1;
}

else
{
cout << " The list contains -: " << endl;
while (current !=NULL)

{
cout << current->movie_name << endl;

for ( int a = 0; a < 3; a++)
cout << current-> cast_name[a] << endl;
cout << current-> movie_genre << endl;
cout << current-> movie_rate << endl;
cout << " *************** " << endl;

current = current->link ;
}
}

}

//***************************************************
// Else if condition to satisfy option number 4 from the Main Menu.
// Searching for an item.
//***************************************************
else if (choice == 4)
{
cout << " Enter the movie name you want to search for. " << endl;
cin >> label1;

movie_node* search = head;

//***************************************************
// If condition to check for an empty linked list.
//***************************************************
if (search == NULL)
{
return-1;
}

//***************************************************
// Moving to the next node for searching the movie.
//***************************************************
else
{
while (search->movie_name != label1 && search->link !=NULL)
{
search = search->link;
}

//***************************************************
// If condition to display the movie searched for.
//***************************************************
if (search->movie_name == label1)
{
cout << search->movie_genre << endl;
cout<< search->movie_name << endl;
cout<< search->movie_rate << endl;

for (int a = 0; a < 3; a++)
cout << search->cast_name[a] << endl;
}

else
{
return-1;
}

}

}

//***************************************************
// Else if condition to satisfy option number 5 from the Main Menu.
// Quitting the program.
//***************************************************
else if (choice == 5)
{
break;
}

//*********************************************************************************************
// Else condition to satisfy an option out from the options given from 1 to 5 in the Main Menu.
// User re-enters a choice between 1 to 5 from the Main Menu.
//*********************************************************************************************
else (choice <1 || choice >5);
cout << " Your choice made is incorrect. Please choose again an option. " << endl;
}

while ( choice >=1 && choice <=5);

//******************************************
// Pausing the system.
//******************************************
system ("pause");

return 0;
}// End of the main program. 

[cire]

   if (head == NULL)
    {

        for (int a = 0; a < 3; a++)
            head->cast_name[a] = cast_movies[a];

        head->movie_genre = choice2;
        head->movie_name = label;
        head->movie_rate = choice1;
    }

If head is pointing to nothing, dereference it. Does that seem right to you?

[BishoyGabriel]

I still do not get what is the case, here. I think it is something related to pointers. Could someone help me fix this ?

[cire]

I still do not get what is the case, here.

When head is null you use it as if it is not. This results in undefined behavior. Don't do that.

You have a related problem in the else clause following where you also dereference a null pointer.

[ciphermagi]

What cire is getting at is that dereferencing an empty pointer leads to undefined behaviour. In your case, the pointer that you're dereferencing (you're attempting to read the value that it points to) is NULL (the code that he quoted).

What you need to do is either assign that pointer to point to something or change
if (head == NULL)
to
if (head != NULL)

You also have similar problems elsewhere.