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.

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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.

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