file handling in c 2b 2b

1// reading a text file
2#include <iostream>
3#include <fstream>
4#include <string>
5using namespace std;
6
7int main () {
8  string line;
9  ifstream myfile ("example.txt");
10  if (myfile.is_open())
11  {
12    while ( getline (myfile,line) )
13    {
14      //use line here
15    }
16    myfile.close();
17  }
18
19  else cout << "Unable to open file"; 
20
21  return 0;
22}

1// basic file operations
2#include <iostream>
3#include <fstream>
4using namespace std;
5
6int main () {
7  ofstream myfile;
8  myfile.open ("example.txt");
9  myfile << "Writing this to a file.\n";
10  myfile.close();
11  return 0;
12}

1#include <iostream>
2#include <fstream>
3#include <cstring>
4#include <process.h>
5using namespace std;
6int main()
7{
8    char name[999]; //Used to store data
9    ofstream writeMode; //Created object of ofstream
10    writeMode.open("name.dat"); //Opened the file in write mode
11    cout<<"******** Writing into file ********"<<endl;
12    cout<<"Enter your name: ";
13    cin.getline(name, 999); //Accepts string with spaces and after spaces eg ____ ____
14    writeMode<<name<<endl; //Putted data inside the file
15    cout<<"Enter your age: ";
16    cin>>name;
17    cin.ignore(); //Wrote because number is accepted :P, may be
18    writeMode<<name<<endl; //Again putted data inside the file
19    writeMode.close(); //Closed the write mode
20    ifstream readMode; //Created object of ifstream
21    readMode.open("name.dat"); //Opened the file in read mode.
22    cout<<"******** Reading into file ********"<<endl;
23    readMode>>name;
24    cout<<name<<endl; //Write the data to the screen
25    readMode>>name; //again read the data from the file and display it
26    cout<<name<<endl;
27    readMode.close(); //Closed the read mode
28    system("pause");
29    return 0;
30}