Algorithm IGCSE Cheat Sheet by [deleted]

FOR LOOP 
Use a FOR loop when you know how many times it'll run     
    
The syntax:
FOR variable = something to something
    do something
NEXT

The example:
FOR number = 1 to 3:
    PRINT number
NEXT

THE REPEAT LOOP
Use a REPEAT loop when you know how many times it'll run      

The syntax:
REPEAT 
    do something
UNTIL something

The example:
number = 1
REPEAT
    PRINT number
    number = number + 1
UNTIL number = 3

THE WHILE LOOP
Use WHILE loop when you don't know how many times it'll run      

The syntax:
WHILE something DO
    do something
ENDWHILE

The example:
number = 1
WHILE number < 3 DO
    PRINT number
    number = number + 1
ENDWHILE

Syntax:
IF condition
    THEN do something
    ELSE do something else
ENDIF

Example:
khaisar_height = 100 
IF khaisar_height < 120 
    THEN PRINT “Please enter the kids room”
    ELSE PRINT “Please enter the teenagers room”
ENDIF

IF grade > 90 AND behavior > 80
    THEN PRINT "Excellent"
ELIF grade > 80 AND behavior > 70
    THEN PRINT "Well Done"
ELIF grade > 70 AND behavior > 60
    THEN PRINT "Good Job"
ELSE PRINT "Improvement is needed!"
ENDIF

Syntax:
CASE ... OF
    something
    OTHERWISE something
ENDCASE

Example:
CASE grade OF
    'A' : PRINT "Excellent"
    'B' : PRINT "Well Done"
    'C' : PRINT "Good Job"
    'D' : PRINT "Do Better"
    'F' : PRINT "Find Another Answer"
    OTHERWISE PRINT "Improve next time"
ENDCASE

The syntax:

FUNCTION do_something(Parameters)
    statements
    RETURN something
END PROCEDURE

Example:

FUNCTION count_pizza_slices(number_of_pizza)
    number_of_pizza_slices = 0
    number_of_pizza_slices = number_of_pizza * 8
    RETURN number_of_pizza_slices
END PROCEDURE