Data Types

Question 1

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

Answer 1

String

Question 2

Why should numeric types not be used for storing phone numbers?

Answer 2

Numeric types would omit the leading 0.

Question 3

Perform an AND mask on the binary numbers 1010110101011011 and 00001001.

Answer 3

Result: 00001001.

Question 4

Which data type stores a collection of characters?

Answer 4

String.

Question 5

Add the two binary numbers 01011011 and 00111010. What is the answer in decimal?

Answer 5

Result: 114.

Question 6

What is the decimal 45 in binary? Give your answer as a byte.

Answer 6

101101

Question 7

What is the hexadecimal 2E in decimal?

Answer 7

Result: 46.

Question 8

What is the hexadecimal 45 in binary? Give your answer as a byte.

Answer 8

1000101

Question 9

Which data type stores just True and False?

Answer 9

Boolean.

Question 10

What is -5 in sign magnitude binary? Give your answer as a nybble.

Answer 10

1101

Question 11

What does the binary 01101100 represent in hexadecimal?

Answer 11

6C.

Question 12

What is the effect of a logical shift left by one place?

Answer 12

The value is doubled.

Question 13

What is the two’s complement binary 10101101 in decimal?

Answer 13

-83

Question 14

The binary 0011010000110 is a floating point number with a single-bit sign 8-bit mantissa and 4-bit exponent. What is the number in decimal?

Answer 14

52

Question 15

Perform a logical shift right by two places on the binary number 01101010 and convert your result to decimal.

Answer 15

Result: 26.

Question 16

Perform an XOR mask on the binary numbers 01010101 and 10111011.

Answer 16

Result: 11101110.

Question 17

Which of the following is not a character? A B C D

Answer 17

D.

Question 18

The binary 1100110000011 is a floating point number with a single-bit sign 8-bit mantissa and 4-bit exponent. What is the number in decimal?

Answer 18

-9.5.