Link to Chapter 9 : File Handling - Database

Header file:     #include<fstream>

Declaration:    ifstream fin("data.txt");  //Input

                        ofstream fout("data.txt"); //Ouput

Read in:           fin>>id>>price; //Read in one line

              while(fin>>id>>price){ } //Read in entire file

Writing to file:  fout<<id<<"  "<<price<<endl;

Close file:    fin.close();

                    fout.close();

Sample load and storefunctions (reading your data file into an array:

//Student Example for load

void load(){

          n=0;

          z=0;

          ifstream studentFile("students.txt", ios::in);

          ifstream courseFile("courses.txt", ios::in);

          while(studentFile>>e[n].fname>>e[n].lname>>e[n].major>>e[n].gpa){

                   n++;}//WHILE

          while(courseFile>>c[z].CRN>>c[z].title>>c[z].department>>c[z].room){

        z++;}//WHILE

}//LOAD

//Employee Example for load

void load(){

    ifstream fin("employee.txt",ios::in);

    while(fin>>e[n].fname>>e[n].lname>>e[n].hourlyrate>>e[n].hoursworked){

        e[n].netpay=e[n].hourlyrate*e[n].hoursworked;

        n++;}//WHILE

}//LOAD

//Employee example for store

void store(){

    ofstream fout("employee.txt",ios::out);

    for(int i=0; i<n; i++){

        if(e[i].fname!=" ")

        fout<<e[i].fname<<" "<<e[i].lname<<" "<<e[i].hourlyrate<<" "<<e[i .hoursworked<<endl;

        }//FOR

}//STORE
 

//Student example for store

void store(){

          ofstream studentFile("students.txt",ios::out);

          for(int i=0; i<n; i++){

                   if(e[i].fname!=" ")

                             studentFile<<e[i].fname<<" "<<e[i].lname<<" "<<e[i].major<<" "<<e[i].gpa<<endl;

          }//FOR

          ofstream courseFile("courses.txt", ios::out);

          for(int j=0; j<z; j++){

                   if(c[j].CRN!=" ")

                             courseFile<< c[j].CRN << " "<<c[j].title << " "<<c[j].department << " "<<c[j].room<<endl;

          }//FOR

}//STORE