Page 4 - KMK PREPSPM2 1819 ANSWER

SULIT No. Matrik…………………………………….… No. Kad Pengenalan………………………….. SC015

(b) Identifiers are the names of variables, classes, methods, packages, and
interfaces. All identifiers must begin with letters, dollar sign ($) or underscore
(_).
(i) Explain variables and constant.
[3 marks]
Identifiers Explanation Example of Declaration
A location in the
Variable computer’s memory int total;
to store a value.
An identifier with a
value that cannot be
Constant final int MIN_WEIGHT = 50;
changed during
normal execution.

(ii) Identify the most suitable primitive data types for the following
situations.
a. To store the gender of a student whether M (for male) or F (for
female).
[1 mark]
char

b. Used to perform logical operations, most commonly to determine
whether some condition is true.
[1 mark]
boolean

c. To store age and number of siblings of a student.
[1 mark]
int

d. To store the value of an average of five marks entered by a user.
[1 mark]
double

3 An array consists of its data type, size, index, and value. All arrays start from index 0
to number of elements n minus 1 (n-1). We use an array when the data size is bigger.
All elements in an array consists of the same data type.
(a) Define array.
[1 mark]
An array is an ordered indexed collection of data values of the same type.

(b) Define the following terms in an array.
(i) Index
[1 mark]
The address for the array elements starting from 0 to n-1 where n is
the size of the array.

4 SULIT