OCR Exam Reference Language IDE

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Variables

OCR Exam Reference Language Commands

Concept	Keyword(s)/Symbols	Example
Comment	`//`	`// This is a comment`
Assignment	`=`	`x = 3`
Constants / Globals	`const`, `global`	`const vat = 0.2`, `global userID = "Cust001"`
Input / Output	`input(...)`, `print(...)`	`name = input("Enter name")`, `print(name)`
Casting	`str()`, `int()`, `float()`, `real()`, `bool()`	`int("3")`, `real("4.52")`

Subprograms	Syntax	Example
Procedure	`procedure name(...)` ... `endprocedure`	`procedure printName(name)` ... `endprocedure`
Function	`function name(...)` ... `return ...` ... `endfunction`	`function squared(n)` ... `return squared`
Random Numbers	`random(...,...)`	`random(1,6)` (integer), `random(-1.0,10.0)` (real)

Selection / Iteration	Syntax	Example
IF	`if ... then`, `elseif ... then`, `else`, `endif`	`if answer == "Yes" then ... endif`
SWITCH	`switch ... :`, `case ... :`, `default:`, `endswitch`	`switch day : case "Sat": ... default: ... endswitch`
FOR	`for ... = ... to ... step ...`, `next ...`	`for i = 10 to 0 step -1` ... `next i`
WHILE	`while ...`, `endwhile`	`while answer != "Correct" ... endwhile`
DO UNTIL	`do` ... `until ...`	`do ... until answer == "Correct"`

Files / Arrays / Strings / Operators	Commands	Notes
File Handling	`newFile()`, `open()`, `.readLine()`, `.writeLine()`, `.endOfFile()`, `.close()`	Use a file variable, e.g. `myFile = open("scores.txt")`
Arrays	`array name[n]`, `array name[r,c]`, `name[i]`, `name[i,j]`	Arrays are 0-indexed
String Operations	`.length`, `.substring(x,i)`, `.left(i)`, `.right(i)`, `.upper`, `.lower`	Includes `ASC(...)` and `CHR(...)`
Comparison	`==`, `!=`, `<`, `<=`, `>`, `>=`	Boolean: `AND`, `OR`, `NOT`
Arithmetic	`+`, `-`, `*`, `/`, `^`, `MOD`, `DIV`	`^` is exponent