Garbage Stored in file

Could anyone explain why garbage storing in the file that is created.
When i try to display the information its the same rubbish coming on the screen.

Code:

#include <iostream>
#include <fstream>
using namespace std;
 
// Declaration of OK_Photo structure
struct OK_Photo
{
	char name[20];		        //Employee Full Name
	char dept[20];	    	    //Department Employee works in
	float overtime;	            //Overtime worked
	float hrs;		            //Hours worked
	float deductions;           // Salary Deductions
	int EmpNum;                 // Employee Number
};
 
//Function Prototypes
int menu();
void AddRecord(fstream &);
void DisplayRecord(fstream &);
void ChangeRecord(fstream &);
/*
void Pay(fstream &);
 */
 
int main()
{
	int choice;
	fstream payroll ("payroll.txt", ios::app | ios::binary);
	OK_Photo record = {" ", 0, 0.0};
 
	//writing the blank records
	for (int count = 0; count < 5; count++)
	{
		payroll.write(reinterpret_cast<char *>(&record), sizeof(record));
	}
 
	//inventory.read(reinterpret_cast<char *>(&record), sizeof(record));
 
	payroll.close();
 
	payroll.open("payroll.txt", ios::app | ios::binary);
 
	do
	{
		choice = menu();
		switch (choice)
		{
		case 1: AddRecord(payroll);
			break;
		case 2: DisplayRecord(payroll);
			break;
		case 3: ChangeRecord(payroll);
			break;
			/*
		case 4: Pay(payroll);
			break;
		*/
		case 5: cout << "Exiting Program...\n\n";
		}
	}while (choice != 5);
 
	payroll.close();
	return 0;
 
}	
 
int menu ()
{
	int selection;
 
	cout<<"\n\n===== Main Menu ====="<<endl;
	cout << "1) Add Record \n";
	cout << "2) Display Record \n";
	cout << "3) Update Record \n";
	cout << "4) Pay \n";
	cout << "5) Exit Program \n";
	cout << "Please enter[1, 2, 3, 4 or 5]: ";
	cin >> selection;
 
	while (selection< 1 || selection > 5)
	{
		cout << "Invalid Choice!!\n";
		cin >> selection;
	}
	return selection;
}
 
void ChangeRecord(fstream &file)
{
	fstream payroll("payroll.txt", ios::in);
	OK_Photo record;
	 
	// Get the record number of the desired record.
	cout << "\n\nEnter Employee Number for update: \n";
	cin >> record.EmpNum;
 
	// Move to the record and read it.
	payroll.seekg(record.EmpNum * sizeof(record), ios::beg);
	payroll.read(reinterpret_cast<char *>(&record),
		           sizeof(record));
 
	
	// Display the record contents
	cout << "\n\nEmployee Name: ";
	cout << record.name << endl;
	cout << "Department: ";
	cout << record.dept << endl;
	cout << "Hours Worked: ";
	cout << record.hrs << endl;
	cout << "Overtime: ";
	cout << record.overtime << endl;
    cout << "Deductions :"; 
    cout << record.deductions <<endl;
    cout << "Total Salary :";
    cout << record.hrs + record.overtime - record.deductions;
 
	// Get the new record data.
	cout << "\n\nEmployee Number: ";
	cin >> record.EmpNum;
	
		cout << "Employee Name: ";
	cin.ignore();
	cin.getline(record.name, 20);
	
    	cout << "Department: ";
	cin >> record.dept;
	
	    cout << "Hours Worked: ";
	cin.ignore();
	cin >> record.hrs;
	
    	cout << "Overtime: ";
	cin.ignore();
	cin >> record.overtime;
	
	cout << "Total Deductions: ";
	cin.ignore();
	cin >> record.deductions;
 
	// Move back to the beginning of this record's position.
	payroll.seekp(record.EmpNum * sizeof(record), ios::beg);
 
	// Write the new record over the current record.
	payroll.write(reinterpret_cast< char *>(&record),
		            sizeof(record));
		            
 	     
 	// Close the file.
	file.close();
}
 
void DisplayRecord(fstream &file)
{
	fstream payroll; 
	OK_Photo record;
    payroll.open("payroll.txt", ios::in);
	

	// Get the record number of the desired record.
	cout << "\n\nEmployee Number: ";
	cin >> record.EmpNum;
 
	// Move to the record and read it.
	payroll.seekg(record.EmpNum * sizeof(record), ios::beg);
	payroll.read(reinterpret_cast<char *>(&record),
		           sizeof(record));

  	           
cout<<"\n\n-----Displaying record for Employee " <<record.name<<endl;	 

	// Display the record contents
	cout << "\n\nEmployee Name: ";
	cout << record.name << endl;
	cout << "Department: ";
	cout << record.dept << endl;
	cout << "Hours Worked: ";
	cout << record.hrs << endl;
	cout << "Overtime: ";
	cout << record.overtime << endl;
    cout << "Deductions :"; 
    cout << record.deductions <<endl;
    

	//closing the file
	file.close();
}


 
void AddRecord(fstream &file)
{
	cout << "\n\nPlease enter the information for the new data: \n";
 
	ofstream payroll ("payroll.txt", ios::app);
	OK_Photo record;
 
	//Info of the new data
	
	cout << "\n\nEmployee Number: ";
	cin >> record.EmpNum;
	
		cout << "Employee Name: ";
	cin.ignore();
	cin.getline(record.name, 31);
	
    	cout << "Department: ";
	cin >> record.dept;
	
	    cout << "Hours Worked: ";
	cin.ignore();
	cin >> record.hrs;
	
    	cout << "Overtime: ";
	cin.ignore();
	cin >> record.overtime;
	
	cout << "Deductions: ";
	cin.ignore();
	cin >> record.deductions;
 
	payroll.write(reinterpret_cast< const char *>(&record),
		            sizeof(record));
 
	//closing the file
	file.close();
}

 

Probably undefined behaviour of some kind. As you're using fixed size arrays for strings check that you're not overflowing them, for example, this might:

Code:

		cout << "Employee Name: ";
	cin.ignore();
	cin.getline(record.name, 31);

as record.name is defined as char[20], which gives you 19 characters for the name plus a terminating NULL.

For any more detail you'd also have to post payroll.txt (NOT all of it - just enough to reproduce the problem) and whatever input you're giving the program. Also the output you get could be useful as it might point directly to the problem.