1.4.1 Data Types

Question 1

What is a data type?

Answer 1

A classification of data into groups according to the kind of data they represent e.g., integer, real, char, string, and Boolean.

Question 2

What is casting?

Answer 2

When you convert one data type into another data type.

Question 3

How many bits does a byte represent?

Answer 3

8 bits.

Question 4

What is binary?

Answer 4

A system of representing info using only two digits (0 and 1).

Question 5

What is a bit?

Answer 5

The smallest unit of digital information, representing either an “off” (0) or an “on” (1) state.

Question 6

What data type should be used for storing a phone number like 07886756443?

Answer 6

String
Numeric types would omit the leading 0.

Question 7

What data type should be used for storing a single character such as ‘a’, ‘$’, or ‘5’?

Answer 7

Char

Question 8

Perform an AND mask on the binary numbers:
1101
1011

Answer 8

1001

Question 9

Which data type stores a collection of characters?

Answer 9

String

Question 10

What do the following binary numbers add to:
1. 0+0+0
2. 0+0+1
3. 0+1+1
4. 1+1+1

Answer 10

1. 0
2. 1
3. 10
4. 11

Question 11

What is the decimal 17 in binary? Give your answer as a byte

Answer 11

00010001

Question 12

What does the most significant bit in sign and magnitude represent if it is 1 and if it is 0?

Answer 12

1 means negative number, 0 means positive number.

Question 13

Translate the binary number 1000 1111 to denary using Sign and Magnitude

Answer 13

-15

Question 14

Translate 24 to binary using sign and magnitude

Answer 14

0001 1000

Question 15

What does the most significant bit in Two’s complement represent if it is 1 and if it is 0?