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Functional Programming Answers

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Question 2 (Marks: 50)
The system to be developed for Williams and Son needs to produce the following slip for a
customer once the sale has been concluded.
Please note: For the purpose of this assignment, assume that a customer will only purchase one
unit of each item.
Q.2.1 Write the pseudocode that will produce a slip similar to the one illustrated at
the beginning of the question. Your solution should satisfy the following
requirements:
 The solution must illustrate the use of good programming practices;
 The solution must make use of a loop;
 The loop must make use of a sentinel value.

Q.2.2 The mainline logic of almost every procedural program consists of three parts
namely housekeeping tasks, detail loop tasks and end-of-job tasks. By making
use of flowcharts, show how these parts can be implemented in your solution
for Question 2.1.

Q.2.3 All of your solutions should be structured. Explain why your solution can be
considered a structured solution.
g(0, Y, Y):- !.
g(X, C, R):- Y is X - 1, C1 is C * 2, g(Y, C1, R).

What is the final value of Y after g(3, 2, Y)?
Many devices are build and programmed with another computer than How the first computer was programmed to do something?
1. When the following are true? The following symbols are used:
~ - negation,
v – disjunction,
& - conjunction,
-> - implication

1. p & ~p v q

2. ~(x v y) = ~x & ~y
3. ~( a -> ~b)

For each of the following, under what circumstances are they TRUE
For example, question 1 is true only when q is true

TRUE 1, FALSE 0

This is about boolean logic

Conjunction: a AND b, a ∩ b, a & b, a && b
True only if both a and b are true
Disjunction: a OR b, a ∪ b, a || b ,
False only if both a and b are false
Negation: NOT a
True only if a is false
Implication: a IMPLIES b
False only when a true and b false
Equivalence: a IS EQUIVALENT TO b, a = b, a == b ,
True when a and b are the same
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