Chapter 7, Problem 5PE

Program Plan Intro

Charge account validation

Program Plan:

• • Declare a function named “readfile()”.
  • ○ The function accepts a file handler “inputfileobject” as a parameter.
  • ○ Create an empty list “chargeaccountlist” to hold the account number from the input file.
  • ○ Use “for” to iterate through the file and fetch the charge account numbers from each line of the file.
  • ○ “append()” function is used to add the fetched charge account numbers from the file to the list “chargeaccountlist”.
  • ○ The function finally returns the list “chargeaccountlist”.
• • Declare a function named “checknumber()”.
  • ○ The function accepts a list “chargeaccountlist” as a parameter.
  • ○ Prompt the user to enter a seven digit charge account number and store in a variable “n”.
  • ○ Use an “if” statement to check whether “n” is in the list “chargeaccountlist”. If the statement returns true, print the user entered charge account number is valid; otherwise, print invalid.
• • In the “main()” function,
  • ○ Open the file “charge_accounts.txt” and assign to “inputfileobject”.
  • ○ Call the function “readfile()” with “inputfileobject” as a parameter and assign the function return to the “chargeaccountslist”.
  • ○ Call the function “checknumber()” with “chargeaccountslist” as a parameter.
• • Finally, call the “main()” to execute the program.