Give me some main concept of file handling

Answer 1

Here I write a commented example about reading files.
Maybe this will help you, I would not know how to explain the concept.

**********************************************
/include header files
#include <fstream>
#include <iostream>
using namespace std;

//main method declaration
int main ()
{
   char data[1000];

    // open a file in read mode.
   ifstream infile;
   infile.open("file.txt");

   cout << "Reading content from the file" << endl;
   infile >> data;

   // write the data
   cout << data << endl;

   //read the data from the file and display it.
   infile >> data;
   cout << data << endl;

   // close the opened file.
   infile.close();

   return 0;

**********************************************

Answer 2

tnx