129761-2015-syllabus

Syllabus content
2.3.6 Structured programming
• use a procedure
• explain where in the construction of an algorithm it would be appropriate to use a procedure
○ given pseudocode will use the following structure for procedure definitions:
PROCEDURE
ENDPROCEDURE
○
a procedure may have none, one or more parameters
○ a parameter can be passed by reference or by value
• show understanding of passing parameters by reference
PROCEDURE (BYREF : )
ENDPROCEDURE
• show understanding of passing parameters by value
PROCEDURE (BYVALUE : )
ENDPROCEDURE
○ a call is made to the procedure using CALL ()
• use a function
• explain where in the construction of an algorithm it is appropriate to use a function
• use the terminology associated with procedures and functions: procedure/function header,
procedure/function interface, parameter, argument, return value
○ given pseudocode will use the following structure for function definitions:
FUNCTION RETURNS // function has no
parameters
ENDFUNCTION
FUNCTION (: )
RETURNS // function has one or more parameters
ENDFUNCTION
○ a function is used in an expression, for example
– x ← SQRT(n)
– WHILE NOT EOF()
• write programs containing several components and showing good use of resources
30 Cambridge International AS and A Level Computer Science 9608. Syllabus for examination in 2015.