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#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace std;
char current;
class Person
{
public:
Person(string newName)
{
name = newName;
nextPerson = 0;
}
string name;
string IDNumb;
Person *nextPerson;
};
Person* pHeadNode;
void DrawMenu()
{
cout << "------------Menu-------------" << endl;
cout << "1. Enter a Person to the List" << endl;
cout << "2. Delete a Person from the List" << endl;
cout << "3. Change a Person's name in the List" << endl;
cout << "4. Display Entries" << endl;
cout << "5. Locate Person by ID Number" << endl;
cout << "6. Locate Person by Name" << endl;
cout << "7. Exit the program" << endl;
cout << "" << endl;
cout << "You choice: ";
}
Person* FindName(string name)
{
if (pHeadNode)
{
Person *pCurrentNode = pHeadNode;
while(pCurrentNode && pCurrentNode->name!=name)
{
if (pCurrentNode->name==name)
return pCurrentNode;
pCurrentNode = pCurrentNode->nextPerson;
}
}
return 0;
}
void InsertNewNode(Person* pNewNode)
{
if (!pHeadNode || (pNewNode->name < pHeadNode->name))
{
pNewNode->nextPerson = pHeadNode;
pHeadNode = pNewNode;
} else {
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode && pCurrentNode->name < pNewNode->name)
{
pPrevNode = pCurrentNode;
pCurrentNode = pCurrentNode->nextPerson;
}
pNewNode->nextPerson = pPrevNode->nextPerson;
pPrevNode->nextPerson = pNewNode;
}
}
void AddNewEntry()
{
string name;
string IDNumb;
cout << "Enter name of new Entry: ";
getline(cin, name);
cin.clear();
cin.sync();
getline(cin, name);
if (pHeadNode)
{
if (FindName(name))
{
cout << "" << endl;
cout << "Name already exists";
cout << "" << endl;
return;
}
}
cout << "Enter ID Number for new Entry: ";
getline(cin, IDNumb);
if (pHeadNode)
{
Person* pNewNode = new Person(name);
pNewNode->IDNumb = IDNumb;
InsertNewNode(pNewNode);
} else {
pHeadNode = new Person(name);
pHeadNode->IDNumb = IDNumb;
}
cout << "" << endl;
cout << "New Entry is added" << endl;
cout << "" << endl;
}
void DeleteEntry()
{
string name;
if (pHeadNode)
{
cin.clear();
cin.sync();
cout << "Enter name of Entry you want to delete: ";
getline(cin, name);
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode && pCurrentNode->name!=name)
{
if (pCurrentNode->name==name)
break;
pCurrentNode = pCurrentNode->nextPerson;
}
if (pCurrentNode)
{
if (pCurrentNode==pHeadNode)
{
pHeadNode = pCurrentNode->nextPerson;
} else {
pPrevNode->nextPerson = pCurrentNode->nextPerson;
}
delete pCurrentNode;
} else {
cout << "" << endl;
cout << "Entry is not found" << endl;
cout << "" << endl;
}
} else {
cout << "" << endl;
cout << "Address book is empty already" << endl;
cout << "" << endl;
return;
}
}
void ChangeEntry()
{
string name;
string IDNumb;
if (pHeadNode)
{
cin.clear();
cin.sync();
cout << "Enter name of Entry you want to edit: ";
getline(cin, name);
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode && pCurrentNode->name!=name)
{
if (pCurrentNode->name==name)
break;
pCurrentNode = pCurrentNode->nextPerson;
}
if (pCurrentNode)
{
cin.clear();
cin.sync();
cout << "Enter name of new Entry: ";
getline(cin, name);
if (pHeadNode)
{
if (FindName(name))
{
cout << "" << endl;
cout << "Name already exists";
cout << "" << endl;
return;
}
}
if (pCurrentNode==pHeadNode)
{
pHeadNode = pCurrentNode->nextPerson;
} else {
pPrevNode->nextPerson = pCurrentNode->nextPerson;
}
delete pCurrentNode;
cout << "Enter ID Number for new Entry: ";
getline(cin, IDNumb);
Person* pNewNode = new Person(name);
pNewNode->IDNumb = IDNumb;
cout << "" << endl;
cout << "Entry is changed" << endl;
cout << "" << endl;
} else {
cout << "" << endl;
cout << "Entry is not found" << endl;
cout << "" << endl;
}
} else {
cout << "" << endl;
cout << "Address book is empty " << endl;
cout << "" << endl;
return;
}
}
void DisplayEntries()
{
string getcontent;
ifstream openfile ("list.txt");
if(openfile.is_open())
{
while(! openfile.eof())
{
getline(openfile, getcontent);
cout << getcontent << endl;
}
}
}
void SearchEntriesName()
{
string name;
string IDNumb;
if (pHeadNode)
{
cin.clear();
cin.sync();
cout << "Enter name of Entry you want to Search: ";
getline(cin, name);
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode && pCurrentNode->name!=name)
{
if (pCurrentNode->name==name)
break;
pCurrentNode = pCurrentNode->nextPerson;
}
cout << pCurrentNode->name << endl;
cout << pCurrentNode->IDNumb << endl;
}
}
void SearchEntriesIDNumb()
{
string name;
string IDNumb;
if (pHeadNode)
{
cin.clear();
cin.sync();
cout << "Enter the ID Number of the entry you want to search: ";
getline(cin, IDNumb);
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode && pCurrentNode->IDNumb!=IDNumb)
{
if (pCurrentNode->IDNumb==IDNumb)
break;
pCurrentNode = pCurrentNode->nextPerson;
}
cout << pCurrentNode->name << endl;
cout << pCurrentNode->IDNumb << endl;
}
}
void SaveListToFile()
{
ofstream outfile;
outfile.open("list.txt");
Person* pCurrentNode = pHeadNode;
while(pCurrentNode)
{
Person* pNode = pCurrentNode;
pCurrentNode = pCurrentNode->nextPerson;
outfile << pNode->name << endl;
outfile << pNode->IDNumb << endl;
}
outfile.close();
}
void LoadListFromFile()
{
ifstream infile;
infile.open("list.txt");
string name;
while (getline(infile, name))
{
string IDNumb;
getline(infile, IDNumb);
if (!pHeadNode)
{
pHeadNode = new Person(name);
pHeadNode->IDNumb = IDNumb;
} else {
Person *pCurrentNode = pHeadNode;
Person *pPrevNode = pCurrentNode;
while(pCurrentNode)
{
pPrevNode = pCurrentNode;
pCurrentNode = pCurrentNode->nextPerson;
}
pPrevNode->nextPerson = new Person(name);
pPrevNode->nextPerson->IDNumb = IDNumb;
}
}
infile.close();
}
int main()
{
int choice;
bool stop = false;
LoadListFromFile();
do
{
do
{
DrawMenu();
cin >> choice;
if (choice<1 || choice>7)
cout << "Incorrect choice. Try again" << endl << endl;
}while(choice<1 || choice>7);
switch(choice)
{
case 1:
AddNewEntry();
break;
case 2:
DeleteEntry();
break;
case 3:
ChangeEntry();
break;
case 4:
DisplayEntries();
break;
case 5:
SearchEntriesIDNumb();
break;
case 6:
SearchEntriesName();
break;
case 7:
cout << "Thank you for using the program" << endl;
stop = true;
break;
default:
break;
}
}while(!stop);
SaveListToFile();
Person* pCurrentNode = pHeadNode;
while(pCurrentNode)
{
Person* pNode = pCurrentNode;
pCurrentNode = pCurrentNode->nextPerson;
delete pNode;
}
return 0;
}
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