Topic 14: Low Level Operations (Representing Real Numbers and Graphics)

Question 1

Real numbers are stored using

Answer 1

floating point representation.

Question 2

When storing very large numbers such as 678,904,321,345, it would become

Answer 2

0.678904321345 x 1012. The .678904321345 and 12 are converted to binary

Question 3

Mantissa indicates the

Answer 3

details or precision of the number. E.g. 0.456 x 10^2 the mantissa is 0.456

Question 4

Exponent indicates the

Answer 4

size or range of a number, so in 0.456 x 10^2 the exponent is 2

Question 5

Graphics are stored in 2 methods which are

Answer 5

bitmap and vector

Question 6

In a bitmap graphic each

Answer 6

pixel on the screen is represented by a binary number. Each pixel requires one bit of storage. An empty pixel =0 and filled pixel = 1

Question 7

Pixel is short for

Answer 7

pixel element, tiny square on screen

Question 8

A vector graphic is stored in a

Answer 8

mathematical format as a list of objects. Each object has attributes which can be edited

Question 9

Typical object attributes are:

Answer 9

Line color, line width, fill colour, object dimensions

Question 10

Translators,translate programs written using

Answer 10

english-like instructions. They are translated into machine code. Interpreters and compilers aid this process.

Question 11

An interpreter

Answer 11

translates and runs code line by line, which is easier for sportting errors but means it runs slower

Question 12

A compilers

Answer 12

translates the whole file at once, and creates a binary version of the file, it runs much faster.