Unit 4 Programming Essay

1029 words - 5 pages

Unit 4

Short Answers 1-7
1. How do modules help you to reuse code in a program?
A. It reduces the duplication of code within a program by reusing the module that was written once.
2. Name and describe the two parts that a module definition has in most languages.
A. Header and a body, header indicates starting point, and the body is a list of statements.
3. When a module is executing, what happens when the end of the module is reached?
A. It’s executed and returned back to the point in main program where it was sidetracked from.
4. What is a local variable? What statement is able to access a local variable?
A. A variable declared inside a local module, only ...view middle of the document...

Display x, “ “, y
Call changeUs (x, y)
Display x, “ “,y
End module
6. What will the following pseudocode program display?
Module changeUs (Integer a, Real b)
Set a = 0
Set b = 0
Display a, “ “, b
End Module
It will not display anything since nothing within the “ “ .
7. What will the following pseudocode program display?
Module main ( )
Declare Integer x =1
Declare Real y = 3.4
Display x, “ “, y
Call changeUs (x, y)
Display x, “ “, y
End Module
Module changeUs (Integer Ref a, Real Ref b)
Set a = 0
Set b = 0.0
Display a, “ “, b
End Module
You would think it displays but in both modules both strings within the quotations marks are blank to display.
Programming Exercises 1, 2
1. Design a modular program that asks the user to enter a distance in kilometers, and then converts that distance to miles. The conversion formula is as follows:
Miles = Kilometers x 0.6214
Module main()
Declare real kilometers
Display “Enter a distance in kilometers”
Input kilometers
Call conversion(kilometers)
End Module
Module conversion(real value)
Declare real miles
Set miles = value * 0.6214
Display miles
End Module
2. Sales Tax Program Refactoring
Programming Exercise 6 in Chapter 2 was the Sales Tax program. For that exercise you were asked to design a program that calculates and displays the county and state sales tax on a purchase. If you have already designed that program, refactor it so the subtasks are in modules. If you have not already designed that program create a modular design for it.
Module main()
Declare real purchase
Display “Enter the amount of purchase.”
Input purchase
Call Module totalState(purchase)
Call Module totalCounty(purchase)
Declare real totalTax
Declare real totalSale
Set totalTax = totalState + totalCounty
Set totalSale = purchase + totalTax
Display “Your amount of purchase is “, purchase
Display “Your total state tax is “, totalState
Display ”Your total county tax is “, totalCounty
Display “Your total tax is “, totalTax
Display “Your total of your sale is “, totalSale
End Module
Module totalState (real Ref purchase)
Set totalState...

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