Question

/* I'm trying to write this program here but my problem is getting the program to save the user input to "int data" but cannot because it is part of the struct. What do I have to do in order to get this to work? (Language is C++)

Write a program that prompts the user to enter numbers on the screen and keep adding those numbers to a linked list.

The program stops when user enters -999. Hint: Use a while loop and include your cin statement in that loop. Stop the loop when user enters -999.

On each iteration, add the node containing the number at the end of the list.
Also write a function to find the smallest number in the linked list you created.*/

#include <iostream>
using namespace std;

struct node {

   int data;
   node *nextNode;

};
void printList(node *currentNode);
int main()
{

   cout << "This program will add numbers to a linked list that you enter, until you enter -999. Then the program will end." << endl;
   cout << "Enter what numbers you wish this program to remember: ";
   cin >> data;

   node *p = new node;
   p->data;
   p->nextNode = NULL;

  

   node *currentNode = p;
   while (currentNode != -999)
   {
       cout << currentNode->data << " ";
       currentNode = currentNode->nextNode;
   }

  
   return 0;
}

Answer 1

#include<iostream>

#include<cstdlib>

using namespace std;

// structure of a node

struct node {

   int data;

   node *nextNode;

};

// display the list

void printList(struct node *);

// insert node in the list

void append(struct node **, int);

int main()

{

    cout << "This program will add numbers to a linked list that you enter, until you enter -999. Then the program will end." << endl;

   

    // create the head of the list

    struct node *head = NULL;

    // infinite loop

    while(1)

    {

        cout << "Enter what numbers you wish this program to remember: ";

        int data;

        cin>>data;

       

        // if user wants to quit

        if( data == -999 )

            break;

           

        // append element to the list

        append(&head, data);

    }

    cout<<"List : ";

    printList(head);

    return 0;

}

// print the elements of the list

void printList(struct node *first)

{

    struct node *temp = first;

   

    // traverse the list

    while(temp!=NULL)

    {

        cout<<temp->data<<" ";

       

        // go to the next node

        temp=temp->nextNode;

    }

   

    cout<<endl;

}

void append(struct node **head, int val)

{

    // create a new node

    struct node *new_node = (struct node *)malloc(sizeof(struct node));

    new_node->data = val;

    new_node->nextNode = NULL;

   

    if((*head) == NULL)

        (*head) = new_node;

    else

    {

        // point trav to head

        struct node *trav = (*head);

       

       // go to the last node

        while(trav->nextNode)

        {

            // go to next node

            trav = trav->nextNode;

        }

       

        // append new_node to the end of the list

        trav->nextNode = new_node;

    }

}

Sample Output