Unit 2 Programming (C7)

Question 1

What is a variable?

Answer 1

A location in memory that can store one or more values in RAM. They are assigned an identifier upon creation.

Question 2

What is an identifier?

Answer 2

A name given to a variable which allows the programmer to distinguish it from other variables.

Question 3

What are the four data types?

Answer 3

String, Integer, Float, Real, Boolean

Question 4

What is a string?

Answer 4

Data which contains a sequence of characters that can be letters, numbers or special characters.

Question 5

What is an integer?

Answer 5

Data which contains only whole numbers

Question 6

What is a real?

Answer 6

Data which contains decimal numbers

Question 7

What is a Boolean?

Answer 7

Data which contains a “True” or “False” statement

Question 8

What is an input?

Answer 8

Data entered by the user into the program

Question 9

What is casting?

Answer 9

Changing the data type of a variable, such as an integer, 54, to a string “54”. This can be done by using the name of the data type and putting the data or variable in brackets i.e. str(54)

Question 10

What is a modulus (a MOD number)?

Answer 10

The remainder that is left when a number is divided by another. Represented by the % sign i.e. 5 % 2 = 1

Question 11

What is a quotient (a DIV number)?

Answer 11

Returns the nearest whole number of a division (known as the quotient) i.e. 5 // 2 = 2

Question 12

What is an exponential?

Answer 12

Multiplying a number to the power of another (squaring cubing etc.)

Question 13

What is a concatenation?

Answer 13

The linking of two strings using a +

Question 14

What is string traversal?

Answer 14

Programming software is able to keep track of the position of every character within the string, allowing you to change individual characters without affecting the whole string.

Question 15

What do you use to change the case of a variable?

Answer 15

variable.upper() or variable.lower()

Question 16

What do you use to calculate the length of a string?

Answer 16

len(variable)

Question 17

What is a substring?

Answer 17

A string of characters that exists within a larger string, for example the first name of Harry Smith would be [0:5]
and the last name would be [7: ]

Question 18

What is a comparison and what symbols can be used to make one?

Answer 18

A comparison is a operator used to decide the result of a program by comparing 2 or more values using symbols such as = == != < <= > >=

Question 19

What is an operator?

Answer 19

A symbol used to instruct a program to perform a specific operation. Examples include + - * / % // ** == != < <= > >= and or not