getline of file C++

Here are the explanations for each step of using the getline function in C++ to read from a file:

First, you need to include the necessary header file for file input/output operations, which is <fstream>.
You need to declare an instance of std::ifstream class to handle the input file. For example, you can declare it like this: std::ifstream inputFile;.
Next, you need to open the file using the open member function of the std::ifstream class. You can do this by calling the open function on the inputFile object and passing the file name as a parameter. For example: inputFile.open("filename.txt");.
Then, you need to declare a string variable to store the line read from the file. For example: std::string line;.
To read lines from the file, you can use the getline function, passing the input file stream (inputFile) and the string variable (line) as parameters. For example: std::getline(inputFile, line);.
The getline function reads characters from the input file until it encounters a newline character or reaches the end of the file. It stores the characters read into the string variable (line).
You can then process or manipulate the line as needed within your program.
To continue reading subsequent lines from the file, you can call the getline function again with the same parameters. It will read the next line from the file and store it in the string variable.
After you have finished reading from the file, you should close the file using the close member function of the std::ifstream class. You can do this by calling inputFile.close();.
Closing the file is important to release system resources and ensure that the file is properly closed.

That's it! These are the steps involved in using the getline function in C++ to read lines from a file.