Does it look good following all the rules in the description. Yes, It's a long code

Question

Using the Divide and Conquer approach  to modularize your program.

Write a function that displays the menu.

Write a function that calculates and returns the check digit.

Write a function that accepts a single digit and returns the cooresponding barcode string.

Write a function that calculates and returns the postage for a single mailing.

write a function to create and display mailing labels by reading input from the Mailings.txt text file. 
https://code.sololearn.com/c4v7CZT2y80E/?ref=app

Answer 1

The code is very difficult to read! If I were you, I would declare a structure or class and describe the functions and variables there.