55write_closefile.cpp

#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;

int main()
{
    ofstream write("testfile.txt"); // this is an output stream where data will flow from code to file

    // creating a name string and filling it with the string entered by the user
    string name;
    cout << "Enter your name : " << endl;
    cin >> name;
    // writing a string to the file
    write << "My name is " + name; // + or << can be used
    write.close();
    // this off streams the file with the code or program and no operations or changes or activities can be made to or with the file

    // reading from a file
    ifstream read("testfile.txt");

    // creating a string to store data from the file
    string copy;
    getline(read, copy); // this helps to read the entire line, cin or cout treats blank space as termination of string
    cout << "The content of the file : " << copy << endl;
    read.close();

    // OPENING A FILE USING open() MEMBER FUNCTION OF FSTREAMBASE

    ofstream tofile;
    tofile.open("file.txt");
    tofile << "This is a file in progress " << endl;
    tofile << "File is unfinished\n"; // \n can be used for new line
    tofile << "May give error " << endl;
    tofile.close();

    ifstream fromfile;
    fromfile.open("file.txt");
    string s1, s2;
    // fromfile >> s1 >> s2; // taking string from the file into the program's string
    // cout << s1 << s2 << endl;
    /*for (int i = 0; i < 10; i++) // loop can read all the strings separated by blank space using cout
    {
        fromfile >> s2;
        cout << s2 << endl;
    }*/

    // Better way to use loop to read all the content from a file
    string s3;
    while (fromfile.eof() == 0)
    {
        getline(fromfile, s3);
        cout << s3 << endl;
    }

    /*
    USING OF END OF FILE FUNCTION eof() MEMBER FUNCTION OF THE FSTREAMBASE

        This function indicates the end of the file and can be used to read the entire file with while loop
        access the function using ifstream object with dot operator '.'
        If the eof() == 0, it means the file hasn't reached the end
        If eof() == 1, it means we have reached the end of the file
    */
    return 0;
}