Data types.

Question 1

Describes why two’s complement may be preferable to sign and magnitude

Answer 1

It is not easily possible to carry out calculations using sign and magnitude whereas they will work with two’s complement

Question 2

Convert the denary number 43 into 8 bit bindary number

Answer 2

00101011

Question 3

State why a programmer might choose to declare a variable as a floating point number

Answer 3

The variable may need to store decimal numbers,

Question 4

Explain how, using bit shift, the unsigned binary number 00101100 can be divided

Answer 4

by shifting the bits to the right will divide by 2.

Question 5

Identify whenter this number is normalised.

Answer 5

No it has to start with a 01 or 10 to be normalised

Question 6

What are the steps to convert Denary to Binary.

Answer 6

1)Find the biggest place value which, when subtracted
from your number, will not be negative.

2) Put a 1 in that column and subtract the place value
from your number

3)Look for next place value which, when subtracted
from remainder, will not be negative

4) Repeat steps 2 and 3 until you have 0

Question 7

What do we use hexadecimal?

Answer 7

Hex numbers are shorter and more memorable than equivalent binary numbers.
They can easily be converted to and from binary.

Question 8

What is a character set?

Answer 8

All the characters which are recognised/ can be represented by the computer system.

Question 9

What is unicode?

Answer 9

A 16-bit encoding system that has 2^16(65536) different characters in its character set

Question 10

What are the main differences between character sets of uncode and ASCII

Answer 10

• Unicode has a much larger character set
• Can represent many more characters (different characters from different alphabets and even emoji’s
• Unicode has 16 bits and ascii has 7