Assignment 03

• option 5: This option will quit the program.

The menu of options is to be displayed after each choice is made until the quit option is chosen. In addition, your program is to display an appropriate error message if the user chooses options 2 - 4 without having first entered a student number. It should do similarly if options 3 or 4 are chosen before option 2 has been chosen. Option 3 does not necessarily have to precede option 4; Bart's formula addresses that situation. All inputs that can be checked for validity ("input cleansing") should be.

Special Requirement: Since you now know the rudiments of functions in C++, you are required to use the following specified functions in your solution code:

1. A function called greeting() that returns nothing but outputs an opening message to the user of the program. (After hw 3, you probably shouldn't do this anymore since a greeting message is really only one line of code and doesn't require use of a function.)

2. A similar function called sign_off().

3. A function named get_student_number() that performs the functionality described above for option #1. It will have no parameters, return a 7-digit integer, and repeatedly prompt/read in values from the user until a 7-digit integer is entered.

4. A function named validate_student_number() that will be passed the student number entered under option #1 and return true if valid, false if not. This function is called when option #2 is chosen.

5. A function that is called when option #3 is chosen, called input_assets(). It will prompt for and return the monetary value of assets of the user. It should have no parameters.

6. A function that is passed user assets (assumed 0 if none have been entered), calculates and returns the BFA. You can think of a good name for this one, and what it should return and what parameters it should (or should not) have.

To help you out with this program, here is a pseudo-code for the program:

begin main

declare variables

greeting()

loop menu choice

present menu

read in choice

switch on choice

opt1

get_student_number()

flag num entered

opt2

validate_entered_number()

flag and announce results

opt3

input_assets()

opt4

calculate and return BFA with your appropriately named function

opt5

quit

end switch

end loop on menu

sign_off()

end main function

Note: This is not c++ code. It is pseudo-code; you turn it into c++. And, this is just one way to think about the program; there are others. Furthermore, we have left out many details, included some hints as to what you should include, left out much. It is your job to fill in the details and code it to work properly.

Since you will be outputting monetary values, you will want to use some "magic code" (until we explain it later in the semester) that will force the output of a decimal number to have exactly 2 figures after the decimal point. So when you try to output 3 1/2 dollars, it will come out as $3.50 instead of $3.5, which would look silly. Here's the code:

cout.setf(ios::fixed); cout.setf(ios::showpoint); cout.precision(2);

After this code, all floating point output will have exactly 2 figures after the decimal point.

As usual, if you have questions, don't hesitate to ask your instructor or Bart. Don't bother asking Krusty because he doesn't know anything!

¹No, you aren't going to get extra points for this. Sometimes, you just have to do things because you want to.