01 Practical

Practical

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H2 Computing Class Notes (tutorials)

• CANNOT use break, pass, continue. Use while loop.

Pseudo-Code Guide

• CANNOT use slicing, range, for char in string, etc

Pseudocode	Python
ENDIF/FOR/WHILE/FUNCTION	-
ELSE IF (ENDIF after the set of IF + ELSE IF + ELSE)	ELIF
INPUT / OUTPUT X	x = input(“...”) print(x)
Array[i, j] Fixed size array (set the size, initialise?)	List[i][j] Append to array
list[i] ← value	Append to list
DECLARE array with size, data type, etc E.g. DECLARE names: ARRAY[1:6] of STRING ⇒ array starts from 1 MAXSIZE = 40 DECLARE scores: ARRAY[0:MAXSIZE-1] of INTEGERS ⇒ array starts from 0 DECLARE scores: ARRAY[1:6, 1:4] of INTEGER DECLARE avgs: ARRAY[1:6] of REAL DECLARE total: ARRAY[1:4] of INTEGER BEGIN FUNCTION grades2rp(grades:STRING) RETURNS BOOLEAN ENDFUNCTION REPEAT UNTIL ⇒ run at least once, then check condition DO WHILE ⇒ check condition first before running FUNCTION ⇒ returns something PROCEDURE ⇒ does not return	-
FOR i = 0 TO length(list) - 1 string[i], list[i]	for char in string for item in list
for i ← 0 to 9	for i in range(10)
^	**
//	#
DIV	//
MOD	%
x ← x + 1	x += 1
-	String methods
temp = ‘ ’ for i ← 0 to 4 temp ← temp + str[i]	String/list slicing [:]

rafael’s notes: CP - Complete Notes

ernest’s notes: Computing Notes

jerome’s solutions for mr loh’s CPs: Computing Solutions

IDLE ⇒ Help ⇒ Python docs

Practical: put data file in same folder, don’t use file path

COPY (not move, else may accidentally edit / delete) the files to your own output folder

Display / Output = print NOT return

PRINT for error statements

WRITE COMMENTS on code for practical

CLOSE FILES

Remove codes / comments used for debugging and re-run

OOP

• Use private attributes
• Use get methods e.g.
  getName(self):

return self._name

• No need set methods

• Set parameters = None as initialisation in init

• No need set methods

• Set parameters = None as initialisation in init