Run of the Program

Congratulations! You now understand why programmers are paid lots of money (and don't have a life...) The framework that greatly helps in fitting the small tasks together is made up of control structures. You may recall that this is called structured programming.

Let us run the program and look at its output. Here is the program:

' Get the starting balance 
PRINT "What is the starting balance"
INPUT BALANCE
'
' Determine transaction type 
PRINT "Type a 'D' for a deposit or a 'C' for a check"
INPUT TYPE$
'
IF TYPE$ = "D" THEN
  ' Process a deposit. 
  PRINT "What is the deposit amount"
  INPUT DEPOSIT
  LET BALANCE = BALANCE + DEPOSIT
ELSE
  ' Process a check. 
  PRINT "What is the check amount"
  INPUT CHECK
  LET BALANCE = BALANCE - CHECK
END IF
'
' Print the new balance. 
PRINT "The new balance is", BALANCE
'
END

Say that the user wanted to make a Deposit of $1000, and already has $500.32 in the account. Here is the dialogue with the user:

What is the starting balance
? 500.32
Type a 'D' for a deposit or a 'C' for a check
? D
What is the deposit amount
? 1000
The new balance is   1500.32