goldshakil
commented
4 years ago Although questions were allowed until yesterday here I am answering.
You have to input the file names in the terminal (black screen). If the file names are wrong ( there is a mismatch between the names and the actual file names) you have to ask the user to input the names one more time.
If the file names and the actual file names match you proceed to the next screen.
I actually cannot understand about welcome screen. There are two txt files already(math, science), but what is the purpose of input txt file names? What is the meaning of successfully uploaded? and when should we go to main screen exactly? (Once we get math or science.txt filename? After we get both math and science.txt filenames? first file, second file,....until when?) Thank you for watching.