Pseudocode

 

You may be required to write an algorithm using pseudocode or to interpret an algorithm written in pseudocode.

 

In general, a pseudocode is similar to program written in Pascal. So there is no need to ‘learn’ how to write if you know how to write in Pascal.

Some tips:

	Pascal	Pseudocode
Loop	For i := 1 to n do	For i from 1 to n do
Assign	n := 1	n ß 1
Return a result from a function Sample	sample := true	Return true
Display on the screen	Writeln (a)	Display a

 

Relevant past paper:

Write pseudocode

DSE ICT Elect B(SP-2017):  PP 1ai. 2013 1biii. 2014 2cii. 2015 3bi,c,4d. 2016 2b,d,3b,4b. 2017 1bii, 4b,cii.

CE CIT Elect A(2005-2011): 2008 2c. 2009 3d. 2010 1bii,c. 2011 1bc,3eii.

 

Comprehension

DSE ICT Elect B(SP-2017):  SP 1. PP 1ab. 2012 1ab, 4b. 2013 1,2,3dii,iii. 2014 4ab. 2015 1abci,ii. 2016 1c,4a. 2017 2a-d.

CE CIT Elect A(2005-2011): 2007 1. 2010 1bi. 2011 1ad, 3ei.

Programming – Pascal: Essential skills 8

Other commands

 

Random()

 

To generate different random numbers when the same program is run, use the command randomize.

Random(100) generates a number with a possible range of 0 – 99.

var                 a : integer; begin randomize;                         (* when the same program is run again, a different set of random number is generated *) a := Random(100) + 1      (* possible values of a = 1-100 *) end;

 

Trunc()

 

The function trunc() changes a real number into an integer by simply removing the decimal part.

e.g. trunc(2.99) becomes 2

 

Multiple select: case … of

 

Instead of using multiple if… statements, we can better organize the program by using case … of.

var                 a : integer; being                 case a of                                 1..3 : writeln (‘less than 4’);                                 4..6 : writeln (‘between 4 and 6’);                                 7..9 : writeln (‘between 7 and 9’)                 else                                 Writeln (‘out of range’)                 end end;

 

Relevant past paper:

DSE ICT Elect B(SP-2017):  2013 3di.

CE CIT Elect A(2005-2011): 2007 3ab. 2009 1ad, 4bi. 2010 3bcd.