Chapter 3

Question 1

Define an algorithm

Answer 1

An algorithm is a precise sequence of steps to produce a result.

A program is an encoding of an algorithm in a language to solve a particular problem.

Question 2

Define a value

Answer 2

A value is a data item that is manipulated by the computer.

Question 3

Define a variable or identifier

Answer 3

A variable or identifier is the name that the programmer uses to refer to a location in memory.

catbox

Question 4

Define datatype

Answer 4

A datatype is the type of data stored at a location in memory.

Question 5

Define location

Answer 5

A location has an address in memory and stores a value.

Question 6

IMPORTANT: The value at a given location in memory (named using a variable name) can change using

Answer 6

IMPORTANT: The value at a given location in memory (named using a variable name) can change using

initialization or assignment.

Question 7

IMPORTANT: The value at a given location in memory (named using a variable name) can change using

Answer 7

IMPORTANT: The value at a given location in memory (named using a variable name) can change using

initialization or assignment.

Question 8

Syntax that represents permanent data that doesn’t change.

Answer 8

named constant

final datatype CONSTANTNAME = VALUE;

final double PI = 3.14159;
final int SIZE = 3;

CONSTANTNAME = CAPS

Question 9

Byte

Answer 9

(-128 to 127)

8 bit range

Question 10

short

Answer 10

16 bit range

Question 11

long

Answer 11

64 bit signed

Question 12

float

Answer 12

32-bit less precise

Question 13

double

Answer 13

64 bit more precise