Saving variables for the next time the computer runs the same program?

Is there a way to save variables for the next time the computer runs the same program?

Ex: at the end of the program, I have a variable that adds one to itselft. So if the first time I ran the program, its value was 1, the next time, its value will be 2. And so on.

Is there any way I can do this?

You have to create a file, and save a variable value to it. Read about file streams (fs)

In particular, you'll want to read up on fs.open().