Question

in this coding please add an address for the student to enter... note that this coding use linked list and a file text to store its data ...Please make sure the address will work with all the functions below..to check whether your coding is correct after you finished adding a new dummy student data and its information close the program and reopen it and choose the option 5 ... I've tried adding an address before but an error occurred when I reopen the program and enter option 5

int addStudent();

void display();

int update();

int search();

void save();

void read();

my coding is in the link below

https://docdro.id/2p3LNsA

Answer 1

Screenshot

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Program

#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <string>
#include <windows.h>
using namespace std;
struct st
{
   string id;
   char name[50];
   char grade;
   string phone;
   string dateofbirth;
   char address[100];
   struct st* next;
};
struct st* hptr = 0; // declare null header of linked list
int addStudent();
int delete_student();
void display();
int update();
int search();
void save();
void read();
void logo();
int main()
{
   logo();
   char ch;
   int opt;
   ifstream file("database.txt");
   if (!file) {
       goto shortcut;
   }
   else
       read();
   do
   {
   shortcut:
       cout << "\nChoose option :\n\n"
           "============================================\n"
           "\n\t1.Add Student\n"
           "\t2.Remove Student\n"
           "\t3.Update Student Information\n"
           "\t4.Search Student\n"
           "\t5.Display Records\n"
           "\n ======================================"
           << endl;
       cin >> opt;
       cout << endl;
       if (opt == 1) {
           addStudent();
           save();
       }
       else if (opt == 2) {
           delete_student();
           save();
       }
       else if (opt == 3) {
           update();
           save();
       }
       else
           if (opt == 4) {
               search();
           }
           else if (opt == 5) {
               display();
           }
           else {
               cout << "Invaild Option, Try again...!\n";
               cout << "\n" << endl;
               system("pause");
               system("CLS");
               main();
           }
       cout << "Do you wants another operation(y/n)? : ";
       cin >> ch;
   } while (ch == 'Y' || ch == 'y');
}
/* Add Student */
int addStudent()
{
   st* temp = new st;
   st* temp1 = new st;
   cout << "Enter student ID :";
   cin >> temp-> id;
   cout << "Enter name:";
   cin.ignore();
   cin.getline(temp-> name, 50, '\n');
     cout << "Enter grade:";
   cin >> temp-> grade;
   cout<< "Enter phone number: ";
   cin >> temp-> phone;
   cout << "Enter date of birth [day/month/year]: ";
   cin >> temp-> dateofbirth;
   cout << "Enter address: ";
   cin.ignore();
   cin.getline(temp->address, 100, '\n');
   // Head of linked list is null
   if (hptr == 0)
   {
       temp-> next = hptr;
       hptr = temp;
       return 0;
   }
   else
   {
       temp1 = hptr;
       while (temp1-> next)
           temp1 = temp1-> next;
       temp-> next = temp1-> next; //NULL
       temp1-> next = temp;
       return 0;
   }
   return -1;
}
/* Delete Student */
int delete_student()
{
   string idno;
   st* temp = new st;
   st* temp1 = new st;
   cout << "Do you want to delete a record ,then enter student ID : ";
   cin >> idno;
   temp = hptr;
   while (temp)
   {
       if (temp-> id == idno)
       {
           // searching record is head
           if (temp == hptr)
           {
               hptr = temp-> next;
               free(temp);
               return 0;
           }
           else
           {
               temp-> next = temp-> next;
               free(temp);
               return 0;
           }
       }
       temp1 = temp;
       temp = temp-> next;
   }
   cout << "Record is not found..!\n";
   return -1;
}
/* Update the grade of the st
udent */
int update()
{
   string idno;
   st* temp = new st;
   st* temp1 = new st;
   cout << "Enter student ID :";
   cin >> idno;
   temp = hptr;
   while (temp)
   {
       if (temp-> id == idno)
       {
           cout<< "Enter grade to update:";
           cin >> temp-> grade;
           cout << "Enter phone number to update:";
           cin >> temp-> phone;
           cout << "Enter address to update: ";
           cin.ignore();
           cin.getline(temp->address, 100, '\n');
           return 0;
       }
       temp1 = temp;
       temp = temp-> next;
   }
   cout<< "Record not found..!\n";
   return -1;
}
/* search the student */
int search()
{
   string idno;
   st* temp = new st;
   st* temp1 = new st;
   cout << "Enter student ID :";
   cin >> idno;
   temp = hptr;
   cout<< "|Student ID .\n | Name\n | Grade\n | Phone number\n | Date of birth\n | Address" << endl;
   cout << "------------------------------------------ -\n";
       while (temp)
       {
           if (temp-> id == idno)
           {
               cout << temp-> id << "\n" << temp-> name << "\n" << temp-> grade << "\n" <<temp-> phone << "\n" << temp-> dateofbirth << "\n" <<temp->address<<"\n"<<endl;
cout << "------------------------------------------------ -"<<endl;
return 0;
           }
           temp1 = temp;
           temp = temp-> next;
       }
   cout << "Record is not present..!\n";
}
/* Display the record */
void display()
{
   system("cls");
   cout << "|Student ID.\n | Name\n | Grade\n | Phone number\n | Date of birth\n | Address" << endl;
   cout<< "------------------------------------------ -\n";
   struct st* ptr;
   ptr = hptr;
   while (ptr)
   {
       cout << ptr-> id << "\n" << ptr-> name << "\n"<< ptr-> grade << "\n" << ptr-> phone<< "\n" << ptr->dateofbirth << "\n"<<ptr->address<<"\n"<<endl;
cout << "------------------------------------------------ -"<<endl;
ptr = ptr-> next;
   }
}
void save()
{
   // stores the current data of linked list in database.txt
   ofstream fout("database.txt");
   struct st* ptr;
   ptr = hptr;
   while (ptr)
   {
       fout << ptr-> id << "\n" << ptr-> name << "\n" << ptr-> grade << "\n" << ptr-> phone<< "\n"<<ptr-> dateofbirth << "\n"<<ptr->address<<"\n";
ptr = ptr-> next;
   }
}
void read()
{
   // reads from file database.txt
   // keeps reading till end of file.
       // stores the data in the currect linked list.
       // you can use display() to view data that is read from database.txt.
       ifstream fin("database.txt");
   string id;
   while (fin >> id) {
       st* temp = new st;
       st* temp1 = new st;
       temp-> id = id;
       fin.ignore();
       fin.getline(temp-> name, 49, '\n');
fin >> temp-> grade;
       fin >> temp-> phone;
       fin >> temp-> dateofbirth;
       fin.ignore();
       fin.getline(temp->address, 99, '\n');
       // Head of linked list is null
           if (hptr == 0)
           {
               temp-> next = hptr;
               hptr = temp;
           }
           else
           {
               temp1 = hptr;
               while (temp1-> next)
                   temp1 = temp1-> next;
               temp-> next = temp1-> next; //NULL
               temp1-> next = temp;
           }
   }
}
void logo()
{
   system("COLOR 0E");
   cout << "\n\n\n\n";
       cout<< "\t\t======================================== = " << endl;
       string hello = "\n\n\t\t WELCOME TO STUDENT MANAGMENT SYSTEM ";
       int x = 0;
   while (hello[x] != '\0') {
       cout << hello[x];
   if (hello[x] != ' ' && hello[x] != '\n')
       Sleep(50);
       x++;
};
cout << "\n\n\t\t======================================== = " << endl;
cout << "\n";

system("pause");
   system("COLOR 07");
   system("cls");
   }

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Output(After exit then restart application and press 5)

|Student ID.
| Name
| Grade
| Phone number
| Date of birth
| Address
------------------------------------------ -
2
Mia Mark
A
457896
05/05/2001
#403,block 3,RTSD

------------------------------------------------ -
Do you wants another operation(y/n)? : n