what does this block of code do?

[DudeYtakeMyUsrnm]

Can someone explain me, line by line what does this code do?
Thank you!
code:

using namespace std;



void LOG(string input) {
fstream LogFile;
LogFile.open("dat.txt", fstream::app);
if (LogFile.is_open()) {
LogFile << input;
LogFile.close();
}
}

using namespace std;



void LOG(string input) {
	fstream LogFile;
	LogFile.open("dat.txt", fstream::app);
	if (LogFile.is_open()) {
		LogFile << input;
		LogFile.close();
	}
}

[Repeater]

This is a function. The function is named "LOG". The function accepts a single input parameter, of type string, named "input".

The function creates an fstream object, named "LogFile". That fstream object is then opened; the file created is named "dat.txt". It is opened in such a way that if it already exists, new data will be added to the end of it.

If that file was opened successfully, the value of the input string is added to the function, and the file is closed.

In summary, this function adds a string to the end of a file named "dat.txt"

[DudeYtakeMyUsrnm]

Thank you very much!