Unit 4 Assignment

Short Answers
1. Modules allow the programmer to write an operation once, and then be able to execute it any time needed later in the code.

2. Header – The starting point of the module
Body- The list of statements that belong to the module

3. The program returns to the memory address just after from where the module was called, and continues to execute

4. A local variable is a variable that is declared from within the module. Only statements in that module can access it.

5. A local variable’s scope begins at the variable’s declaration and ends at the end of the module in which it is declared.

6. Passing an argument by value is a one-way communication from the main program to the module. Changes to the parameter variable inside the module do not affect the argument in the calling part of the program.

Passing an argument by reference is a two-way communication from the main program to the module and it allows modification of the variable in the calling program

7. Global variables make a program difficult to debug because any statement in a program file can change the value of a global variable. If you find that the wrong value is being stored in the global variable, you have to track down every statement that accesses it to determine where the bad value is coming from.

1. Module timesTen (integer originalNumber by value) Set a = originalNumber * 10 Input a Display “The answer is “, a

5. Module getNumber (integer number by reference) Display “Please enter a number” Input number

6. 1 3.14 0 0
1 3.14

7. 1 3.4 0 0
1 3.4

1. Module Main ()
Declare real kms = 0
Display “This will convert kilometers to miles.”
Display “Please enter kilometers“
Input kms
Call getMiles(kms) End Module Module getMiles(Real kms by value) Declare real miles Set miles = kms *