Basic Operation On Text File In C++

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Program to write in a text file

#include<fstream.h>
int main()
{
     ofstream fout;
     fout.open("out.txt");
     char str[300]="Time is a great teacher but unfortunately it kills all its pupils. Berlioz";
     fout<<str;
     fout.close();
     return 0;
}

Program to read from text file and display it

#include<fstream.h>
#include<conio.h>
int main()
{
     ifstream fin;
     fin.open("out.txt");
     char ch;
     while(!fin.eof())
     {
          fin.get(ch);
          cout<<ch;
     }
     fin.close();
     getch();
     return 0;
}

Program to count number of characters.

#include<fstream.h>
#include<conio.h>
int main()
{
     ifstream fin;
     fin.open("out.txt");
     clrscr();
     char ch; int count=0;
     while(!fin.eof())
     {
          fin.get(ch);
          count++;
     }
     cout<<"Number of characters in file is "<<count;
     fin.close();
     getch();
     return 0;
}

Program to count number of words

#include<fstream.h>
#include<conio.h>
int main()
{
     ifstream fin;
     fin.open("out.txt");
     char word[30]; int count=0;
     while(!fin.eof())
     {
          fin>>word;
          count++;
     }
     cout<<"Number of words in file is "<<count;
     fin.close();
     getch();
     return 0;
}

Program to count number of lines

#include<fstream.h>
#include<conio.h>
int main()
{
     ifstream fin;
     fin.open("out.txt");
     char str[80]; int count=0;
     while(!fin.eof())
     {
          fin.getline(str,80);
          count++;
     }
     cout<<"Number of lines in file is "<<count;
     fin.close();
     getch();
     return 0;
}

Program to copy contents of file to another file.

#include<fstream.h>
int main()
{
     ifstream fin;
     fin.open("out.txt");
     ofstream fout;
     fout.open("sample.txt");
     char ch;
     while(!fin.eof())
     {
          fin.get(ch);
          fout<<ch;
     }
     fin.close();
     return 0;
}

Basic Operation On Binary File In C++

class student
{
            int admno;
            char name[20];
public:
          void getdata()
          {
                     cout<<"\nEnter The admission no. ";
                     cin>>admno;
                     cout<<"\n\nEnter The Name of The Student ";
                     gets(name);
          }
          void showdata()
          {
                     cout<<"\nAdmission no. : "<<admno;
                     cout<<"\nStudent Name : ";
                     puts(name);
          }
          int retadmno()
          {
                     return admno;
          }
};

function to write in a binary file

void write_data()
{
          student obj;
          ofstream fp2;
          fp2.open("student.dat",ios::binary|ios::app);
          obj.getdata();
          fp2.write((char*)&obj,sizeof(obj));
          fp2.close();
}

function to display records of file

void display()
{
          student obj;
          ifstream fp1;
          fp1.open("student.dat",ios::binary);
          while(fp1.read((char*)&obj,sizeof(obj)))
          {
                     obj.showdata();
          }
}
          fp.close();
}

Function to search and display from binary file

void search (int n)
{
          student obj;
          ifstream fp1;
          fp1.open("student.dat",ios::binary);
          while(fp1.read((char*)&obj,sizeof(obj)))
          {
                     if(obj.retadmno()==n)
                                obj.showdata();
          }
          fp1.close();
}

Function to delete a record

void deleterecord(int n)
{
          student obj;
          ifstream fp1;
          fp1.open("student.dat",ios::binary);
          ofstream fp2;
          fp2.open("Temp.dat",ios::out|ios::binary);
          while(fp1.read((char*)&obj,sizeof(obj)))
          {
                      if(obj.retadmno!=n)
                                    fp2.write((char*)&obj,sizeof(obj));
          }
          fp1.close();
          fp2.close();
          remove("student.dat");
          rename("Temp.dat","student.dat");
}

Function to modify a record

void modifyrecord(int n)
{
          fstream fp;
          student obj;
          int found=0;
          fp.open("student.dat",ios::in|ios::out);
          while(fp.read((char*)&obj,sizeof(obj)) && found==0)
          {
                     if(obj.retadmno()==n)
                     {
                              obj.showdata();
                              cout<<"\nEnter The New Details of student";
                              obj.getdata();
                              int pos=-1*sizeof(obj);
                              fp.seekp(pos,ios::cur);
                              fp.write((char*)&obj,sizeof(obj));
                              found=1;
                    }
          }
          fp.close();
}

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