In C++, file handling allows you to work with files for reading from and writing to external files. This is useful when you need to store data persistently or retrieve data from existing files.

To work with files in C++, you will need to include the and headers. The header is used for input and output operations, while the header is specifically for working with files.

To write data to a file, you will need to create an ofstream object, which stands for output file stream. You can then use the object to open the file using the open() function, specifying the file name as the argument.

Once the file is opened, you can use the output stream operator << to write data to the file. For example, you can write a string to the file by using outputFile << "Hello, AlgoDaily!".

After writing the data, make sure to close the file using the close() function of the ofstream object.

To read data from a file, you will need to create an ifstream object, which stands for input file stream. Similar to writing, you can use the open() function to open the file for reading.

To read data from the file, you can use the input stream operator >>. For example, you can read a string from the file by using inputFile >> data;, where data is a string variable.

After reading the data, make sure to close the file using the close() function of the ifstream object.

Here's an example code that demonstrates file handling in C++:

1#include <iostream>
2#include <fstream>
3
4using namespace std;
5
6int main() {
7  // Create a file
8  ofstream outputFile;
9  outputFile.open("data.txt");
10
11  // Write data to the file
12  outputFile << "Hello, AlgoDaily!";
13
14  // Close the file
15  outputFile.close();
16
17  // Read data from the file
18  ifstream inputFile;
19  inputFile.open("data.txt");
20
21  string data;
22  inputFile >> data;
23
24  // Print the data
25  cout << "Data read from the file: " << data << endl;
26
27  // Close the file
28  inputFile.close();
29
30  return 0;
31}

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}

#include <iostream>

#include <fstream>

​

using namespace std;

​

int main() {

  // Create a file

  ofstream outputFile;

  outputFile.open("data.txt");

​

  // Write data to the file

  outputFile << "Hello, AlgoDaily!";

​

  // Close the file

  outputFile.close();

​

  // Read data from the file

  ifstream inputFile;

  inputFile.open("data.txt");

​

  string data;

  inputFile >> data;

​

  // Print the data

  cout << "Data read from the file: " << data << endl;

​

  // Close the file

  inputFile.close();

​