Muhib_Codes
File Handling
Basic things you remember before doing to file handling
1.#include<fstream>//library must include every time
2.file.open("fileName.txt"); //To open the txt file in teh folder wher you have cpp program
(if you don't make it then this is made ownly)
3.ifstream fin; //to read data from the file
4.ofstream fout; //To write data into the file (!file.eof()--------)
*********Binary Filing******** **fstream file;
*file.open("fileName.txt",ios::out ios::binary ios::app);//To write the data into the file in bianry form
*file.open("fileName.txt",ios::in ios::binary);//To read the data into the file in bianry form
*file.cloe(); //must be apply after every file open or write in the fstream case beacuse file does not know in which mode it works
******To get data or write data from the file in binary*****
file.write(reinterpret<cast*>(&varibleName),sizeof(varible_dataType)); //for write
file.read(reinterpret<cast*>(&varibleName),sizeof(varible_dataType)); //for read
file.seekp(sizeinbytes,offsest(ios::beg or ios::cur or ios::end)); //To move the curser position or set it when writing data into the file
file.seekg(sizeinbytes,offsest(ios::beg or ios::cur or ios::end)); //To move the curser position or set it when reading data into the file
file.tellp()/sizeof(varible_dataType)+1; //give the cursor of the data index when writing data into the file
file.tellg()/sizeof(varible_dataType)+1; //give the cursor of the data index when reading data into the file
Very basic steps of file handing
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
//declare Variables
int a;
char ch;
float x;
//Declare variable of fstream class and make object to open the files
ifstream fin;
ofstream fout;
//open the output and input files
fin.open("InText.txt");
fout.open("outText.txt");
//reading the data from the input file with extraction operator
fin>>a;
fin>>ch;
fin>>x;
//writing the data into the output file with the insertion operator
fout << a << endl;
fout << ch << endl;
fout << x << endl;
fout << a << endl;
fout << ch << endl;
fout << x << endl;
fin.close();
return 0;
}
Write Copy file 1 into the file 2 and aslo show data of the file 1 into the console.
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
int a;
ifstream fin;
ofstream fout;
fin.open("inText.txt");
fout.open("outText.txt");
fout<<"These are the numbers that are to be stored in the input file:"<<endl;
while(!fin.eof())
{
fin>>a;
cout<<a<<endl;
fout<<a<<endl;
}
return 0;
}
Find out the prime,odd and even numbers in the file.
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ofstream fout;
ifstream fin;
int num;
fin.open("inText.txt");
fout.open("outText.txt");
if (fin.is_open())
{
cout<<"File is opened:"<<endl;
while (!fin.eof())
{
fin >> num;
if (num % 2 == 0)
{
fout << num << " is an even number:" << endl;
}
else
{
fout << num << " is an odd number:" << endl;
}
int count = 0;
for (int i = 1; i <= num; i++)
{
if (num % i == 0)
{
count++;
}
}
if (count == 2)
{
cout << endl;
fout << num << " is also an Prime number:" << endl;
cout << endl;
}
}
}
else
{
cout << "File is not opened:" << endl;
}
return 0;
}
Data from the txt file to the output file
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int size = 100;
char arr[size];
ifstream fin;
ofstream fout;
fin.open("inText.txt");
fout.open("outText.txt");
fin.getline(arr, size);
for (int i = 0; arr[i] != '\0'; i++)
{
fout << arr[i];
}
return 0;
}
Writing Text
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
int size=100;
char arr[size];
ifstream fin;
ofstream fout;
fin.open("inText.txt");
fout.open("outText.txt");
cin.getline(arr,size);
for(int i=0;arr[i]!='\0';i++)
{
fout<<arr[i];
}
return 0;
}
Struct Reading and writing in binary
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
const int totalStudents = 5;
struct student
{
string name;
string rollNum;
};
int main()
{
student st1[totalStudents];
fstream file;
string search;
// if you want to write the data into the file then uncomment it
// file.open("studentsData.txt", ios::out | ios::binary );
// if(file.is_open())
// {
// for (int i = 0; i < totalStudents; i++)
// {
// cout << "Enter the name of the student:" << endl;
// getline(cin, st1[i].name);
// cout << "Enter the Roll Number of the student:" << endl;
// getline(cin, st1[i].rollNum);
// file.write(reinterpret_cast<char *>(&st1[i]), sizeof(student));
// }
// }
// else
// {
// cout<<"Error Occured:"<<endl;
// }
// file.close();
// if you read the data from the file to the console
cout << "Enter the string thet you want to search by name:" << endl;
getline(cin, search);
file.open("studentsData.txt", ios::in | ios::binary);
if (file.is_open())
{
for (int i = 0; i < totalStudents; i++)
{
string rollno;
file.read(reinterpret_cast<char *>(&st1[i]), sizeof(student));
if (st1[i].name == search)
{
// cout<<"Enter the roll number of the student to be updated:"<<endl;
// getline(cin,rollno);
// file.close();
// file.open("studentsData.txt", ios::out | ios::binary);
// st1[i].rollNum=rollno;
// file.write(reinterpret_cast<char *>(&st1[i]), sizeof(student));
cout<<st1[i].name<<endl;
cout<<st1[i].rollNum<<endl;
}
break;
}
}
else
{
cout << "Error Occured:" << endl;
}
file.close();
}
Project:
Blood Donor Management system through the binary filing
**Feature**
1.Add Donor data
2.Search Donor data by name
3.Search Donors data by blood group
4.Update the Donor data after the successful donation
5.Delete the Donor data
6.Display all the donor data
#include <iostream>
#include <fstream>
#include <conio.h>
#include <string>
using namespace std;
// global Variables
fstream file;
ofstream temp;
const int totalRecords = 1000;
// Structure
struct record
{
string name;
string rollNum;
string PhoneNum;
string bloodGroup;
int no_ofDonate;
string dateof_Donation;
string permanentAddress;
};
// For display
void display(int total)
{
for (int i = 0; i < 4; i++)
{
cout << endl;
}
cout << "\t\t\t*************FCIT BLOOD DONOR MANAGEMENT SYSTEM*****************" << endl;
cout << endl;
cout << "\tTotal Records :" << total << endl;
cout << endl;
cout << "\t\t\t _______________________________________________________________________________" << endl;
cout << "\t\t\t| Press \"A\" to ADD the DONOR\'S Record |" << endl;
cout << "\t\t\t| Press \"N\" to SEARCH the DONOR\'S Record based on NAME |" << endl;
cout << "\t\t\t| Press \"B\" to SEARCH the LIST of DONOR\'S Record based on BLOOD GROUP |" << endl;
cout << "\t\t\t| Press \"U\" to UPDATE the DONOR\'S Record after successful DONATION |" << endl;
cout << "\t\t\t| Press \"R\" to REMOVE the DONOR\'S Record (may be due to medical reasons) |" << endl;
cout << "\t\t\t| Press \"W\" to SHOW ENTIRE the DONOR\'S Record |" << endl;
cout << "\t\t\t| Press \"Q\" to QUIT..... |" << endl;
cout << "\t\t\t --------------------------------------------------------------------------------" << endl;
}
// Function for display record of specific Donor
void recordOf_specificDonor(record donor[], int i)
{
cout << "\t\t\t\t****************DATA OF THE DONOR " << i + 1 << " ************" << endl;
cout << "\t\t\t\tName of the donor " << i + 1 << " : " << donor[i].name << endl;
cout << "\t\t\t\tRoll number of the donor " << i + 1 << " : " << donor[i].rollNum << endl;
cout << "\t\t\t\tPhone number of the donor " << i + 1 << " : " << donor[i].PhoneNum << endl;
cout << "\t\t\t\tBlood Group of the donor " << i + 1 << " : " << donor[i].bloodGroup << endl;
cout << "\t\t\t\tNumber of blood donates of the donor " << i + 1 << " : " << donor[i].no_ofDonate << endl;
cout << "\t\t\t\tLast Date blood Donation of the donor " << i + 1 << " : " << donor[i].dateof_Donation << endl;
cout << "\t\t\t\tPermenant Address of the donor " << i + 1 << " : " << donor[i].permanentAddress << endl;
cout << endl;
}
// Adding the record
void addRecord(record donor[], int index)
{
file.open("bds_donor_data.txt", ios::out | ios::app | ios::binary);
if (file.is_open())
{
cout << endl;
cout << "\t\t\t**************ADDING RECORD OF THE DONOR****************" << endl;
cout << endl;
cout << "\t\t\tEnter the name of the donor " << index + 1 << " : ";
getline(cin, donor[index].name);
cout << "\t\t\tEnter the roll number of the donor " << index + 1 << " : ";
getline(cin, donor[index].rollNum);
cout << "\t\t\tEnter the phone number of the donor " << index + 1 << " : ";
getline(cin, donor[index].PhoneNum);
cout << "\t\t\tEnter the blood group of the donor " << index + 1 << " : ";
getline(cin, donor[index].bloodGroup);
cout << "\t\t\tEnter the number of blood donate of the donor " << index + 1 << " : ";
cin >> donor[index].no_ofDonate;
cin.ignore();
cout << "\t\t\tEnter the date of the donation of the donor " << index + 1 << " : ";
getline(cin, donor[index].dateof_Donation);
cout << "\t\t\tEnter the permannent home address of the donor " << index + 1 << " : ";
getline(cin, donor[index].permanentAddress);
cout << endl;
file.write(reinterpret_cast<char *>(&donor[index]), sizeof(record));
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
file.close();
}
// Displaying the all records
void displayAll_records(record donor[], int index)
{
cout << endl;
cout << "\t**DATA OF THE ALL DONORS**" << endl;
cout << endl;
file.open("bds_donor_data.txt", ios::in | ios::binary);
if (file.is_open())
{
for (int i = 0; i < index; i++)
{
file.read(reinterpret_cast<char *>(&donor[i]), sizeof(record));
recordOf_specificDonor(donor, i);
}
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
file.close();
}
// Function for search record by name
void search_record_ByName(record donor[], int index)
{
string searchBy_name;
bool found = false;
cout << endl;
cout << "\t\t\t Enter the name of the donor to search its data:";
getline(cin, searchBy_name);
cout << endl;
file.open("bds_donor_data.txt", ios::in | ios::binary);
if (file.is_open())
{
cout << "\t\t\t\t****************DATA OF THE DONOR " << searchBy_name << " ************" << endl;
for (int i = 0; i < index && found == false; i++)
{
file.read(reinterpret_cast<char *>(&donor[i]), sizeof(record));
if (donor[i].name == searchBy_name)
{
recordOf_specificDonor(donor, i);
found = true;
break;
}
}
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
file.close();
if (found == false)
{
cout << "\t\t\t Error: No such name can be exist in the donor's list:" << endl;
}
}
// Function for search all records by blood group
void search_record_ByBloodGroup(record donor[], int index)
{
string searchBy_bloodGroup;
bool found = false;
cout << endl;
cout << "\t\t\t Enter the blood group :";
getline(cin, searchBy_bloodGroup);
cout << endl;
cout << "\t\t\t\t**DATA OF THE ALL THE DONORS WHOSE HAVE " << searchBy_bloodGroup << " BLOOD GROUP **" << endl;
file.open("bds_donor_data.txt", ios::in | ios::binary);
if (file.is_open())
{
for (int i = 0; i < index; i++)
{
file.read(reinterpret_cast<char *>(&donor[i]), sizeof(record));
if (donor[i].bloodGroup == searchBy_bloodGroup)
{
recordOf_specificDonor(donor, i);
found = true;
}
}
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
file.close();
if (found == false)
{
cout << "\t\t\t Error: No such blood group can be exist in the donor's list:" << endl;
}
}
// Function for update the donors record after successful donation
void update_record_ofDonor(record donor[], int index)
{
string updateBy_name;
bool found = false;
cout << endl;
cout << "\t\t\t Enter the name of the donor to update its data:";
getline(cin, updateBy_name);
cout << endl;
file.open("bds_donor_data.txt", ios::in | ios::binary | ios::out);
// to get the curser at the start use the seekg
file.seekg(0);
if (file.is_open())
{
for (int i = 0; i < index && found == false; i++)
{
file.read(reinterpret_cast<char *>(&donor[i]), sizeof(record));
if (donor[i].name == updateBy_name)
{
// updation
cout << "\t\t\t** Donor blood donation times updated from " << donor[i].no_ofDonate << " to " << donor[i].no_ofDonate + 1 << "**" << endl;
cout << "\t\t\t Enter the date of the updated Donation:";
getline(cin, donor[i].dateof_Donation);
donor[i].no_ofDonate = donor[i].no_ofDonate + 1;
// to change the position of the getting cursor position use seekp
// ios::cur is the offset of the seekp that gives that we want to be beg,cur and end position of the file
// seekp has the two arguments first gives how much bytes it can move,and second argument gives where to start move the position where
// negative sign show move forward or backward
file.seekp(-sizeof(record), ios::cur);
file.write(reinterpret_cast<char *>(&donor[i]), sizeof(record));
found = true;
}
}
cout << endl;
cout << "\t\t\t\t Recorded Updated Successfully:" << endl;
cout << endl;
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
file.close();
if (found == false)
{
cout << "\t\t\t Error: No such Person's name can be exist in the donor's list:" << endl;
}
}
// Function for Remove donor’s record (May be due to medical reasons).
void delete_record_ofDonor(record donor[], int index)
{
string deleteBy_rollNum;
bool found = false;
cout << endl;
cout << "\t\t\t Enter the roll number of the donor to Remove his/her record (May be due to medical reasons).";
getline(cin, deleteBy_rollNum);
cout << endl;
file.open("bds_donor_data.txt", ios::in | ios::binary | ios::out);
temp.open("temp.txt", ios::binary | ios::out);
// to get the curser at the start use the seekg
if (file.is_open() && temp.is_open())
{
for (int i = 0; i < index; i++)
{
file.read(reinterpret_cast<char *>(&donor[i]), sizeof(record));
if (donor[i].rollNum != deleteBy_rollNum)
{
// Copying data from bds_donor_data.txt to temp.txt except the deleted data
temp.write(reinterpret_cast<char *>(&donor[i]), sizeof(record));
found = true;
}
}
file.close();
temp.close();
// Removation of non-removed data file
remove("bds_donor_data.txt");
// Rename the temp file to the bds_donor_data.txt
rename("temp.txt", "bds_donor_data.txt");
cout << endl;
cout << "\t\t\t\t Recorded Deleted Successfully:" << endl;
cout << endl;
}
else
{
cout << endl;
cout << "\t\t\t File is not openend:" << endl;
cout << endl;
}
if (found == false)
{
cout << "\t\t\t Error: No such Roll Number name can be exist in the donor's list:" << endl;
}
}
// Body of the program
void blood_donor_managementSystem()
{
record donors[totalRecords];
bool flag = false;
bool iF_recordAdded = false;
char input;
do
{
// to determine the number of total records added
char ch[] = {};
int index = 0;
int i = -1;
file.open("bds_donor_data.txt", ios::in | ios::binary);
while (!file.eof())
{
file >> ch[i];
if (i % sizeof(record) == 0)
{
index++;
}
i++;
}
file.close();
// To check whether atleast one data is entered or not otherwise other options cannot works
if (index > 0)
{
iF_recordAdded = true;
}
// display function call
display(index);
// Input
input = getch();
input = tolower(input);
// Input Validation
while (input != 'a' && input != 'n' && input != 'b' && input != 'u' && input != 'r' && input != 'w' && input != 'q')
{
cout << endl;
cout << "\t\t\t Error:Invalid Input!" << endl;
cout << "\t\t\t Please Enter the Valid Input" << endl;
input = getch();
input = tolower(input);
cout << endl;
}
// Switch cases---Cases can be run on the inputs
switch (input)
{
// adding records
case 'a':
{
addRecord(donors, index);
system("cls");
break;
}
// search record by name
case 'n':
{
if (iF_recordAdded == true)
{
search_record_ByName(donors, index);
}
if (iF_recordAdded == false)
{
cout << endl;
cout << "\t\t\t\t ***Error:Firstly add the data At least enter the one donors data:***" << endl;
}
break;
}
// search record by blood group
case 'b':
{
if (iF_recordAdded == true)
{
search_record_ByBloodGroup(donors, index);
}
if (iF_recordAdded == false)
{
cout << endl;
cout << "\t\t\t\t ***Error:Firstly add the data At least enter the one donors data:***" << endl;
}
break;
}
// display all the records
case 'w':
{
if (iF_recordAdded == true)
{
displayAll_records(donors, index);
}
if (iF_recordAdded == false)
{
cout << endl;
cout << "\t\t\t\t ***Error:Firstly add the data At least enter the one donors data:***" << endl;
}
break;
}
// update the record
case 'u':
{
if (iF_recordAdded == true)
{
update_record_ofDonor(donors, index);
}
if (iF_recordAdded == false)
{
cout << endl;
cout << "\t\t\t\t ***Error:Firstly add the data At least enter the one donors data:***" << endl;
}
break;
}
// Delete the record
case 'r':
{
if (iF_recordAdded == true)
{
delete_record_ofDonor(donors, index);
}
if (iF_recordAdded == false)
{
cout << endl;
cout << "\t\t\t\t ***Error:Firstly add the data At least enter the one donors data:***" << endl;
}
break;
}
// for quiting the program
case 'q':
{
cout << "Quiting....................." << endl;
flag = true;
break;
}
}
} while (flag == false);
}
// Main function
int main()
{
// blood_donor_managementSystem
blood_donor_managementSystem();
return 0;
}
Whats make this website differents from others?
Amazing Feature That Increase your Productivity
If you don't find any problem,in this website and if you have a very difficult assignment question that is not present on internet ,then you dont bother yourself,we are here to solve every problem of your life you just click on the Problem asking button and write your problem we slove the code of your problem and sent you on your email addres that you put in the sin up form.