Chapter 4 - Data types

Question 1

What is data?

Answer 1

information - the quantities, characters or symbols that operations are performed on by a computer, and which may also be stored and transmitted

Question 2

What is an intiger?

Answer 2

Whole numbers both positive and negative ie 3
usually 1-4 bytes

Question 3

What is a float AKA real numbers

Answer 3

All real numbers - decimals and integers
usually 4-10 bytes

Question 4

What is a character

Answer 4

A single character

Question 5

What is a string?

Answer 5

Multiple characters ( a list of characters ). A char can be a string, but a ( multiple - character ) string cannot be a char.
Typically 1 byte per character

Question 6

What is boolean?

Answer 6

true or false

Question 7

What does a strongly typed language mean?

Answer 7

You must explicitly state the data type when creating the variable ie C or C++

Question 8

What does a weakly-typed language mean?

Answer 8

The programming language “guesses” what data type should be used ie python

Question 9

Fix this code (its python):
height A = input(‘Enter heightA’)
height B = input(‘Enter heightB’)
totalHeight = heightA + heightB
print(totalHeight)

Answer 9

height A = input(‘Enter heightA’)
height B = input(‘Enter heightB’)
totalHeight = int(heightA) + int(heightB)
print(totalHeight)

Question 10

What does len(string) do?

Answer 10

counts number of characters

Question 11

What does string.capitalize() do?

Answer 11

capitlises the first letter

Question 12

What does string.lower() do?

Answer 12

Puts the whole string in lower case

Question 13

What does string.upper() do?

Answer 13

Puts the whole string in upper case

Question 14

What does string.rjust() do?

Answer 14

sets how far across the page the string is. ie “dog”.rjust(50)
= dog

Question 15

What does string.replace(oldvalue,newcalue) do?

Answer 15

replaces a value with a new value

Question 16

What does string.split(separator) do?

Answer 16

Splits the string at a point

Question 17

What does string.strip(characters) do?

Answer 17

Gets rid of characters stated

Question 18

What does string.join(list) do?

Answer 18

makes it into a list

Question 19

What does string.find(substring) do?

Answer 19

used to find the first occurrence of a sub-string in the specified string being called upon.

Question 20

What does string.format(items) do?

Answer 20

he {0} in the format string is a format item. 0 is the index of the object whose string value will be inserted at that position.

Question 21

What does \n do?

Answer 21

Newline

Question 22

What does \t do?

Answer 22

tab

Question 23

What does " do?

Answer 23

prints quote mark

Question 24

What does \ do?

Answer 24

print backslash

Question 25

demoStr = “Mr Reed is an awesome teacher!”
demoStr[3:9]

Answer 25

Reed i

Question 26

demoStr = “Mr Reed is an awesome teacher!”
demoStr[-8:-1]

Answer 26

teacher

Question 27

demoStr = “Mr Reed is an awesome teacher!”
demoStr[:3] + demoStr[22:]

Answer 27

Reed teacher!

Question 28

Combining strings is called what?

Answer 28

Concatenation

Question 29

What can you use index positions to perform?

Answer 29

String traversals iterating through a string to perform tasks

Question 30

Can you give an example code of string traversals

Answer 30

demoStr = “Mr Reed is an awesome teacher!”
for char in demoStr:
if char == “a” or char == “e”
print(“Bingo!”)

Question 31

Since python starts counting index positions from 0, the first character in a string has position …… , meaning that the length of a string is ……….. than the index of it’s final character.

Answer 31

zero
one more