in main cpp Create a separate list for each data type

C++ language

Floating Point Link List Example

// This program demonstrates the deleteNode member function

#include

#include

#include "FloatList.h"

using namespace std;

char menu()

{ char ch;

cout<<"\t\tWhat Operation would like to perform ? ";

cout<<"\t\t\tC. Create a List ";

cout<<"\t\t\tD. Delete a List ";

cout<<"\t\t\tI. Insert a List ";

cout<<"\t\t\tS. Show a List ";

cout<<"\t\t\tQ. Quit the Program ";

cout<<"\t\tEnter your choice ==> ";

cin>>ch;

return ch;

}

int main()

{ FloatList list;

float val;

char choice;

choice = menu();

while (choice !='Q' && choice != 'q')

{ system("cls");

switch(choice) {

case 'C': case 'c':

// Build the list

list.appendNode(2.5);

list.appendNode(7.9);

list.appendNode(12.6);

cout << "Here are the initial values: ";

list.displayList();

cout << endl;

break;

case 'D': case 'd':

cout<<" Here is the contents of the current list ";

list.displayList();

cout<<" Enter your value to be destroyed ..";

cin>>val;

list.deleteNode(val);

cout << " Here are the nodes left. ";

list.displayList();

break;

case 'I': case 'i':

cout<<" Enter your value to be inserted ..";

cin>>val;

list.insertNode(val);

cout << " Here are the new nodes. ";

list.displayList();

break;

case 'S': case 's':

cout<<" Here are the list of nodes .... ";

list.displayList();

}

choice = menu();

}

cout<<" Here are the left over nodes before quitting ... ";

list.displayList();

cout<

return 0;

}

Linklist header File:

// Specification file for the FloatList class

#ifndef FLOATLIST_H

#define FLOATLIST_H

class FloatList

{

private:

// Declare a structure for the list

struct ListNode

{

float value;

struct ListNode *next;

};

ListNode *head; // List head pointer

public:

FloatList() // Constructor

{ head = NULL; }

~FloatList(); // Destructor

void appendNode(float);

void insertNode(float);

void deleteNode(float);

void displayList();

};

#endif

LinkList CPP File:

// Implementation file for the FloatList class

#include // For cout and NULL

#include "FloatList.h"

using namespace std;

//**************************************************

// appendNode appends a node containing the *

// value pased into num, to the end of the list. *

//**************************************************

void FloatList::appendNode(float num)

{

ListNode *newNode, *nodePtr;

// Allocate a new node & store num

newNode = new ListNode;

newNode->value = num;

newNode->next = NULL;

// If there are no nodes in the list

// make newNode the first node

if (!head)

head = newNode;

else // Otherwise, insert newNode at end

{

// Initialize nodePtr to head of list

nodePtr = head;

// Find the last node in the list

while (nodePtr->next)

nodePtr = nodePtr->next;

// Insert newNode as the last node

nodePtr->next = newNode;

}

}

//**************************************************

// displayList shows the value *

// stored in each node of the linked list *

// pointed to by head. *

//**************************************************

void FloatList::displayList()

{

ListNode *nodePtr;

nodePtr = head;

while (nodePtr!= NULL)

{

cout << nodePtr->value << endl;

nodePtr = nodePtr->next;

}

}

//**************************************************

// The insertNode function inserts a node with *

// num copied to its value member. *

//**************************************************

void FloatList::insertNode(float num)

{

ListNode *newNode, *nodePtr, *previousNode = NULL;

// Allocate a new node & store num

newNode = new ListNode;

newNode->value = num;

// If there are no nodes in the list

// make newNode the first node

if (!head)

{

head = newNode;

newNode->next = NULL;

}

else // Otherwise, insert newNode

{

// Initialize nodePtr to head of list and previousNode to NULL.

nodePtr = head;

previousNode = NULL;

// Skip all nodes whose value member is less

// than num.

while (nodePtr != NULL && nodePtr->value < num)

{

previousNode = nodePtr;

nodePtr = nodePtr->next;

}

// If the new node is to be the 1st in the list,

// insert it before all other nodes.

if (previousNode == NULL)

{

head = newNode;

newNode->next = nodePtr;

}

else // Otherwise, insert it after the prev. node.

{

previousNode->next = newNode;

newNode->next = nodePtr;

}

}

}

//**************************************************

// The deleteNode function searches for a node *

// with num as its value. The node, if found, is *

// deleted from the list and from memory. *

//**************************************************

void FloatList::deleteNode(float num)

{

ListNode *nodePtr, *previousNode;

// If the list is empty, do nothing.

if (!head)

return;

// Determine if the first node is the one.

if (head->value == num)

{

nodePtr = head->next;

delete head;

head = nodePtr;

}

else

{

// Initialize nodePtr to head of list

nodePtr = head;

// Skip all nodes whose value member is

// not equal to num.

while (nodePtr != NULL && nodePtr->value != num)

{

previousNode = nodePtr;

nodePtr = nodePtr->next;

}

// If nodePtr is not at the end of the list,

// link the previous node to the node after

// nodePtr, then delete nodePtr.

if (nodePtr)

{

previousNode->next = nodePtr->next;

delete nodePtr;

}

}

}

//**************************************************

// Destructor *

// This function deletes every node in the list. *

//**************************************************

FloatList::~FloatList()

{

ListNode *nodePtr, *nextNode;

nodePtr = head;

while (nodePtr != NULL)

{

nextNode = nodePtr->next;

delete nodePtr;

nodePtr = nextNode;

}

}