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[DJS1618]

I wasn't able to make the lecture for my Intro. to Computer Programming class, and missed quite a bit of explanation involving our homework assignment. I know that what I have so far definitely has a few structural errors, I'm just not sure how to clean this all up to give me a functioning program. Thanks in advance for any help.

Homework assignment description:

'Assignment - 'Objectives:
1. Write the main function by following the flowchart provided.
2. Watch the associated video tutorial “Creating Visio Flowcharts” and study the “Designing a Program – BMI” example program.
3. Draw the flowcharts for the withdrawal, deposit, invalid code, and display new balance functions.
4. Learn how to design and code decision statements.
5. Validate the transaction code and transaction amount.
6. Write the Python program that matches the logic in the flowcharts.

For this assignment, the customer’s account balance will be computed and displayed for a bank transaction. Use the main function flowchart provided to code the main function. Design functions to: 1) process a withdrawal; 2) process a deposit; 3) process an invalid transaction code; and 4) display the customer’s balance after the transaction is complete. The customer’s new balance will be the same as their previous balance if an error has occurred. Use a format specifier to print the customer’s balance for dollars and cents including a dollar sign. Create the flowcharts for the 4 functions and the Python program to solve the problem.

The user will input their name, account ID, transaction code (W or w = withdrawal, D or d = deposit), previous balance, and transaction amount. If an invalid code is entered, an error message is displayed and the balance remains unchanged (i.e. new balance = previous balance). If the customer attempts to withdraw more money than is in their account, a different error message is displayed and the balance remains unchanged. Otherwise, the customer’s balance is adjusted accordingly (i.e. add the transaction amount for deposits and subtract it for withdrawals). The customer’s balance is only printed in the display balance function (i.e. not in any of the other functions).

Calculate the new balance for each set of input test data shown below. Use this test data when verifying your structure chart, flowcharts, and program.'

#-------------------------------------------------------------------------------

#Program:       Bank Transaction

#Programmer:    David Specht

#Date:          2/16/2011

#Abstract:      This program computes and displays a customer's bank transaction.

#-------------------------------------------------------------------------------


#Define the main function

def main():

    #Display the purpose of this program

    print 'This program computes and displays customers account balance for a bank transaction.'


    #Input customer name

    customer_name = raw_input('Please enter your name:')


    #Input customer account ID

    account_id = raw_input('Please enter your account ID:')


    #Input transaction code

    transaction_code = raw_input( 'Please enter W for a withdrawal or D for a deposit:')


    #Input previous balance

    previous_balance = raw_input('Please enter your previous balance:')


    #Input transaction amount

    transaction_amount = raw_input('Please enter the transaction amount: ')


    #Call process withdrawal code enter

    withdrawal_code(transaction_code, process_withdrawal, process_deposit, previous_balance, transaction_amount)


    #Call process to display balance

    display_balance

    

    process_deposit(previous_balance, transaction_amount)

    process_withdrawal(previous_balance, transaction_amount)

    

    

#Define the withdrawal_code function    

def withdrawal_code(transaction_code, process_withdrawal, process_deposit, previous_balance, transaction_amount):


     #Determine if code entered calls for a withdrawal

     if transaction_code == 'W' or transaction_code == 'w':

        process_withdrawal(previous_balance, transaction_amount)


     #Determine if code entered calls for a deposit

     elif transaction_code == 'D' or transaction_code == 'd':

         process_deposit(previous_balance, transaction_amount)

   

     #Display error message

     else:

         print 'Sorry, this is not a valid transaction code. Your balance will remain $%.5f:' % previous_balance 

    

    

def process_withdrawal(previous_balance, transaction_amount):


    new_balance = previous_balance - transaction_amount


    if transaction_amount > previous_balance:

        print 'The amount entered exceeds your current balance'

    else:

        display_balance


    


def process_deposit(previous_balance, transaction_amount):


    new_balance = previous_balance + transaction_amount


#Define the display_balance function


def display_balance(new_balance):

    print 'Your current balance is $%.10f' % new_balance


#Call the main function

main()