U8 - COMPILATION

Question 1

NAME THE SIX STEPS OF THE COMPILATION PROCESS

Answer 1

LEXICAL ANALYSIS
SYMBOL TABLE
SYNTAX ANALYSIS
SEMANTIC ANALYSIS
CODER GENERATION
OPTIMISATION

Question 2

LEXICAL ANALYSIS

Answer 2

Commments and unneeded spaces are removed
Keywords, constants and indentifiers are replaced with tokens

Question 3

SYMBOL TABLE

Answer 3

A table is created to hold the addresses of variables, labels and subroutines

Question 4

SYNTAX ANALYSIS

Answer 4

Tokens are checked to see if they match the expected spelling and grammar.
A message appears if an error is found.

Question 5

SEMANTIC ANALYSIS

Answer 5

Variables are checked to make sure they are the right data type and have properly declared.
Operations are checked to make sure they are legal for the type of variable being used.

Question 6

CODE GENERATION

Answer 6

Machine code is generated for the computer to run

Question 7

OPTIMISATION

Answer 7

Optimised code removes unneccessary parts
Making it more efficient, quicker to run and less resource intense.

Question 8

NAME THE SIX ERROR TYPES

Answer 8

LINKING ERROR
EXECUTION ERROR
LOGICAL ERROR
SYNTAX ERROR
TRUNCATION ERROR
ROUNDING ERROR

Question 9

SYNTAX ERROR

Answer 9

When a program does not follow the expected syntax rules of the language, i.e. missing brackets

Question 10

RUNTIME / EXECUTION ERROR

Answer 10

When a program unexpectedly stops due to an invalid operation, i.e. trying to divide by 0

Question 11

LOGICAL ERROR

Answer 11

Does not stop the code but produces an unexpected output
The result of inputting an incorrect operation, i.e. Using + instead of -

Question 12

LINKING ERRORS

Answer 12

Occurs when compiler is unable to find a subroutine called.
i.e. A module is referenced but not imported

Question 13

TRUNCATION ERROR

Answer 13

Numbers are not accurate, program truncates a real number to a set number of d.p.
i.e. 1.6 = 1

Question 14

ROUNDING ERROR

Answer 14

Occurs when a program rounds a real number to the nearest whole.
i.e. 1.6 = 2