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829 words - 4 pages

Five advantages of using global variables.
It is accessible to all the modules in a program
You only have to declare it once outside the modules
It is good to use it for constants you want to keep consistant
It simplifies maintenance, avoids duplication of local constants.
It can make a program easier to read in reference to constants.

Five disadvantages of using global variables.
It makes debugging difficult
Any statement in a program can change the value
If modules use global variables it is dependent upon the module and if other modules are presented you have to redesign all over each time
It makes a program hard to understand since it can be modified and have to be aware of ...view middle of the document...

By reference its passed into a special modification parameter.
#7 Why do global variables make a program difficult to debug?
Because global is used throughout all modules and hard to track.
Algorithm Workbench Review 1, 5, 6, 7
#1 Design a module named timesTen. The module should accept an Integer argument. When the module is called, it should display the product of its argument multiplied times 10.
Module main()
Call timesTen
Module timesTen (Integer value)
Declare Integer result
Set result = value * 10
Display result
End Module
#5 Design a module named getNumber, which uses a reference parameter variable to accept an Integer argument. The module should prompt the user to enter a number and then store the input in the reference parameter variable.
Module getNumber (Integer Ref value)
Display “Display a number”
Input number
End Module

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 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 he 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...

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