Question

Code in C++:

Please help me fix the error in function:

void write_account(); //function to write record in binary file (NOTE: I able to store data to a txt file but however the data get error when I try to add on data the second time)

void display_all(); //function to display all account details (NOTE: This function is to display all the info that save account.txt which is ID, Name, and Type)
void modify_account(int); //function to modify record of file (NOTE: This function is to modify and change the data in account.txt. Before user can access to the modify the program will check if the input ID match with any ID that had register in account.txt)
void delete_account(int); //function to delete record of file (NOTE: This function is to delete account from the account.txt)

//my code below:

//***************************************************************
// HEADER FILE USED IN PROJECT
//****************************************************************
#include<iostream>
#include <cstdlib>
#include<fstream>
#include<cctype>
#include<iomanip>
using namespace std;

//***************************************************************
// CLASS USED IN PROJECT
//****************************************************************

class account
{
public:
char id[10];
char name[10];
char type;

void create_account(); //function to get data from user
void show_account() const; //function to show data on screen
void modify(); //function to add new data
void report() const; //function to show data in tabular format
const char* retid() const; //function to return account number
int retid() const;   //function to return account number
char rettype() const; //function to return type of account
}; //class ends here

void account::create_account()
{
cout<<"\nEnter The Student ID No. :";
cin>>id;
cout<<"\n\nEnter Student Name (First and Last : ";
cin.ignore();
cin.getline(name,50);
cout<<"\nEnter Type of The account (T/S) : ";
cin>>type;
type=toupper(type);
cout<<"\n\n\nAccount Created..";
}

void account::show_account() const
{
cout<<"\nStudent ID No. : "<<id;
cout<<"\nStudent Name : ";
cout<<name;
cout<<"\nType of Account : "<<type;
}

const char* account::retid() const
{
return this->id;
}

void account::modify()
{
cout<<"\nStudent ID No. : "<<id;
cout<<"\nModify Student Name : ";
cin.ignore();
cin.getline(name,50);
cout<<"\nModify Type of Account : ";
cin>>type;
type=toupper(type);
}

void account::report() const
{
   cout<<id<<setw(10)<<" "<<name<<setw(10)<<" "<<type<<setw(6)<<endl;
}

int account::retid() const
{
   return id;
}

//***************************************************************
// function declaration
//****************************************************************
void write_account(); //function to write record in binary file
void display_all(); //function to display all account details
void modify_account(int); //function to modify record of file
void delete_account(int); //function to delete record of file
void intro(); //introductory screen function

//****************************************************************
// THE MAIN FUNCTION OF PROGRAM
//****************************************************************
int main()
{
char ch;
int num;
intro();
do
{
system("cls");
cout<<"\n\n\n\tMAIN MENU";
cout<<"\n\n\t01. NEW ACCOUNT";
cout<<"\n\n\t02. ALL ACCOUNT HOLDER LIST";
cout<<"\n\n\t03. CLOSE AN ACCOUNT";
cout<<"\n\n\t04. MODIFY AN ACCOUNT";
cout<<"\n\n\t05. EXIT";
cout<<"\n\n\tSelect Your Option (1-5) ";
cin>>ch;
system("cls");
switch(ch)
{
case '1':
write_account();
break;
case '2':
display_all();
break;
case '3':
cout<<"\n\n\tEnter The account No. : "; cin>>num;
delete_account(num);
break;
case '4':
cout<<"\n\n\tEnter The account No. : "; cin>>num;
modify_account(num);
break;
case '5':
cout<<"\n\n\tThanks for using Schedule management system";
break;
default :cout<<"\a";
}
cin.ignore();
cin.get();
}while(ch!='5');
return 0;
}

//***************************************************************
// INTRODUCTION FUNCTION
//****************************************************************

void intro()
{
cout<<"\n\n\n\t Schedule";
cout<<"\n\n\tMANAGEMENT";
cout<<"\n\n\t SYSTEM";
cout<<"\n\n\n\nMADE BY : your name";
cout<<"\n\nSCHOOL : your school name";
cin.get();
}

//***************************************************************
// function to write in file
//****************************************************************

void write_account(){

account ac;
ofstream outFile;
outFile.open("account.txt",ios::binary|ios::app);
ac.create_account();
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
outFile.close();
}

//***************************************************************
//     function to display all accounts deposit list
//****************************************************************

void display_all()
{
   account ac;
   ifstream inFile;
   inFile.open("account.dat",ios::binary);
   if(!inFile)
   {
       cout<<"File could not be open !! Press any Key...";
       return;
   }
   cout<<"\n\n\t\tACCOUNT HOLDER LIST\n\n";
   cout<<"====================================================\n";
   cout<<"A/c no. NAME Type \n";
   cout<<"====================================================\n";
   while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
   {
       ac.report();
   }
   inFile.close();
}

//***************************************************************
//     function to delete record of file
//****************************************************************

void delete_account(int n)
{
   account ac;
   ifstream inFile;
   ofstream outFile;
   inFile.open("account.txt",ios::binary);
   if(!inFile)
   {
       cout<<"File could not be open !! Press any Key...";
       return;
   }
   outFile.open("Temp.dat",ios::binary);
   inFile.seekg(0,ios::beg);
   while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
   {
       if(ac.retid()!=n)
       {
           outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
       }
   }
   inFile.close();
   outFile.close();
   remove("account.txt");
   rename("Temp.dat","account.txt");
   cout<<"\n\n\tRecord Deleted ..";
}

//***************************************************************
//     function to modify record of file
//****************************************************************

void modify_account(int n)
{
   bool found=false;
   account ac;
   fstream File;
   File.open("account.dat",ios::binary|ios::in|ios::out);
   if(!File)
   {
       cout<<"File could not be open !! Press any Key...";
       return;
   }
   while(!File.eof() && found==false)
   {
       File.read(reinterpret_cast<char *> (&ac), sizeof(account));
       if(ac.retid()==n)
       {
           ac.show_account();
           cout<<"\n\nEnter The New Details of account"<<endl;
           ac.modify();
           int pos=(-1)*static_cast<int>(sizeof(account));
           File.seekp(pos,ios::cur);
           File.write(reinterpret_cast<char *> (&ac), sizeof(account));
           cout<<"\n\n\t Record Updated";
           found=true;
       }
   }
   File.close();
   if(found==false)
       cout<<"\n\n Record Not Found ";
}

Answer 1

// Following program is compiling fine. Output is shown below . For complete output you need files account.txt and temp.txt in your working directory as mentioned in code for data

#include<iostream>
#include <cstdlib>
#include<fstream>
#include<cctype>
#include<iomanip>
using namespace std;

//***************************************************************
// CLASS USED IN PROJECT
//****************************************************************

class account
{
public:
int id;
char name[10];
char type;

void create_account(); //function to get data from user
void show_account() const; //function to show data on screen
void modify(); //function to add new data
void report() const; //function to show data in tabular format
int retid() const; //function to return account number
char rettype() const; //function to return type of account
}; //class ends here

void account::create_account()
{
cout<<"\nEnter The Student ID No. :";
cin>>id;
cout<<"\n\nEnter Student Name (First and Last : ";
cin.ignore();
cin.getline(name,50);
cout<<"\nEnter Type of The account (T/S) : ";
cin>>type;
type=toupper(type);
cout<<"\n\n\nAccount Created..";
}

void account::show_account() const
{
cout<<"\nStudent ID No. : "<<id;
cout<<"\nStudent Name : ";
cout<<name;
cout<<"\nType of Account : "<<type;
}

void account::modify()
{
cout<<"\nStudent ID No. : "<<id;
cout<<"\nModify Student Name : ";
cin.ignore();
cin.getline(name,50);
cout<<"\nModify Type of Account : ";
cin>>type;
type=toupper(type);
}

void account::report() const
{
cout<<id<<setw(10)<<" "<<name<<setw(10)<<" "<<type<<setw(6)<<endl;
}

int account::retid() const
{
return id;
}

//***************************************************************
// function declaration
//****************************************************************
void write_account(); //function to write record in binary file
void display_all(); //function to display all account details
void modify_account(int); //function to modify record of file
void delete_account(int); //function to delete record of file
void intro(); //introductory screen function

//****************************************************************
// THE MAIN FUNCTION OF PROGRAM
//****************************************************************
int main()
{
char ch;
int num;
intro();
do
{
system("cls");
cout<<"\n\n\n\tMAIN MENU";
cout<<"\n\n\t01. NEW ACCOUNT";
cout<<"\n\n\t02. ALL ACCOUNT HOLDER LIST";
cout<<"\n\n\t03. CLOSE AN ACCOUNT";
cout<<"\n\n\t04. MODIFY AN ACCOUNT";
cout<<"\n\n\t05. EXIT";
cout<<"\n\n\tSelect Your Option (1-5) ";
cin>>ch;
system("cls");
switch(ch)
{
case '1':
write_account();
break;
case '2':
display_all();
break;
case '3':
cout<<"\n\n\tEnter The account No. : "; cin>>num;
delete_account(num);
break;
case '4':
cout<<"\n\n\tEnter The account No. : "; cin>>num;
modify_account(num);
break;
case '5':
cout<<"\n\n\tThanks for using Schedule management system";
break;
default :cout<<"\a";
}
cin.ignore();
cin.get();
}while(ch!='5');
return 0;
}

//***************************************************************
// INTRODUCTION FUNCTION
//****************************************************************

void intro()
{
cout<<"\n\n\n\t Schedule";
cout<<"\n\n\tMANAGEMENT";
cout<<"\n\n\t SYSTEM";
cout<<"\n\n\n\nMADE BY : your name";
cout<<"\n\nSCHOOL : your school name";
cin.get();
}

//***************************************************************
// function to write in file
//****************************************************************

void write_account(){

account ac;
ofstream outFile;
outFile.open("account.txt",ios::binary|ios::app);
ac.create_account();
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
outFile.close();
}

//***************************************************************
// function to display all accounts deposit list
//****************************************************************

void display_all()
{
account ac;
ifstream inFile;
inFile.open("account.txt",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
return;
}
cout<<"\n\n\t\tACCOUNT HOLDER LIST\n\n";
cout<<"====================================================\n";
cout<<"A/c no. NAME Type \n";
cout<<"====================================================\n";
while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
{
ac.report();
}
inFile.close();
}

//***************************************************************
// function to delete record of file
//****************************************************************

void delete_account(int n)
{
account ac;
ifstream inFile;
ofstream outFile;
inFile.open("account.txt",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
return;
}
outFile.open("Temp.txt",ios::binary);
inFile.seekg(0,ios::beg);
while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
{
if(ac.retid()!=n)
{
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
}
}
inFile.close();
outFile.close();
remove("account.txt");
rename("Temp.txt","account.txt");
cout<<"\n\n\tRecord Deleted ..";
}

//***************************************************************
// function to modify record of file
//****************************************************************

void modify_account(int n)
{
bool found=false;
account ac;
fstream File;
File.open("account.txt",ios::binary|ios::in|ios::out);
if(!File)
{
cout<<"File could not be open !! Press any Key...";
return;
}
while(!File.eof() && found==false)
{
File.read(reinterpret_cast<char *> (&ac), sizeof(account));
if(ac.retid()==n)
{
ac.show_account();
cout<<"\n\nEnter The New Details of account"<<endl;
ac.modify();
int pos=(-1)*static_cast<int>(sizeof(account));
File.seekp(pos,ios::cur);
File.write(reinterpret_cast<char *> (&ac), sizeof(account));
cout<<"\n\n\t Record Updated";
found=true;
}
}
File.close();
if(found==false)
cout<<"\n\n Record Not Found ";
}

// Output