File Input/Output

Question

Create a program that reads numbers from a file named data.dat and writes them to a file named result.dat. The input file should contain exactly one number per line

Answer 1

You can take refrence

https://code.sololearn.com/cmkmyNLkKdIb/?ref=app

https://code.sololearn.com/clR9EqSL17gJ/?ref=app

Answer 2

I have written the program but I am having a problem calling data from the data.dat file
How am I suppose to create the external files