Programming principals

Question 1

Variable

Answer 1

A named data location in a program for a value that can be changed, throughout the execution time.

Question 2

Constant

Answer 2

A named data location in a program for a value that does not change.

Question 3

String

Answer 3

Name given to a series of characters or symbols, which are displayed for a user, when a program is executed.

Question 4

Integer

Answer 4

A whole number that has not a decimal points. Used to store data that would never be a decimal.

Question 5

Real(float)

Answer 5

Have a decimal points. Used to store data that could be decimal.

Question 6

Character

Answer 6

Holds just one character. More efficient way how to store one character compared to string.

Question 7

Boolean

Answer 7

Data type that will hold two values only, such as true/false or yes/no.

Question 8

Algorithm

Answer 8

Set of instructions to solve a problem.

Question 9

Sequence

Answer 9

Instructions that occur one after the other in a particular order.

Question 10

Execution

Answer 10

A program that is run.

Question 11

Selection

Answer 11

Making a choice or a decision in a program.

Question 12

Iteration

Answer 12

Repeating instructions in a program.

Question 13

Condition

Answer 13

A state in a program that will be met or not met.

Question 14

Counting loop(for loop)

Answer 14

Repeats a set of instructions a set number of times.

Question 15

Condition loop(while loop)

Answer 15

Repeats a set of instructions until a certain condition is met.

Question 16

Totalling

Answer 16

Taking a current value and update it while the program is executed.

Question 17

Predefined function

Answer 17

A pre-programmed set of instructions that return a value.

Question 18

Library

Answer 18

A store of pre-programmed instructions that can be imported into a program.

Question 19

Predefined procedure

Answer 19

A pre-programmed set of instructions that do not return a value. E.g. “clear the screen”

Question 20

Array

Answer 20

A store of data values that are all related and of the same data type.

Question 21

Element

Answer 21

An individual item in an array.

Question 22

Advantages of arrays

Answer 22

• store many data values under one name
• easily find an item of data in list
• easily write or read many values

Question 23

Disadvantages of arrays

Answer 23

• once defined, the size of the array cannot be normally changed
• can only hold data of one type