Computers are very good at adding numbers, as we’ve learned from all of our homework assignments.
However, they can become even more efficient by creating sections of code that can be repeated over
and over. These sections are not loops, but are functions. They take in parameters and return some
result.
1 – Assignment
Based on the success of your work calculating the compound interest, HP management wants you to
make the code more efficient and portable by using functions.
When talking about ‘interest’, we are talking about the bank giving you a percentage of your savings
back to you. If you have 2% interest rate, and $1000 in your account, the bank will give you 1000*0.02,
or $20 in interest. Usually this amount is calculated annually, called an “annual percentage rate” APR,
meaning the bank will give you 2% over the entire year. So if you had $1000 in your account the entire
year, you would get $20 at the end of the year. This feels like a long time to wait, so the bank calculates
this interest monthly, but we won’t get into that in this assignment.
Expand upon homework 4 by moving the interest calculation into a function. The function will take in a
parameter, amount, and return a value, interest.
Function CalculateInterest(amount As Double, interestRate As Double)
As Double
% write your code here
Return … %return val
End Function
Your program will have the same output at Homework 4. The only difference is that you will be
calculating the interest in a function. Instead of amount = amount * 2, you will use your function
amount = CalculateInterest(amount, 2). Note: ‘doubling’ your money is the same as
200% interest, or a modifier of 2.
