pseudocode_guide.md

Bane of the theory paper: Pseudocode

1. Style Guide

• CAPSLOCK for keywords, such as IF, REPEAT, PROCEDURE
• camelCase for identifiers (variables, functions, etc.) such as myVariable, myFunction()
• Indentation
• Comment using //

2. Nitty Gritty

2.1 Declaring variables

DECLARE myVariable: INTEGER
DECLARE myArray: ARRAY[1:10] OF INTEGER
DECLARE my2DArray: ARRAY[1:10, 1:10] OF INTEGER
CONSTANT myConstant = 69

2.2 Assignment

myVariable <- 69
myVariable <- myVariable + 1

2.3 Accessing arrays

myArray[1] <- 69
my2DArray[1, 1] <- "*"

2.4 Input/Output (to "console")

INPUT myVariable
OUTPUT myVariable
OUTPUT "Goodbye World"

2.5 Operations

1. Arithmetic: +, -, *, /
2. Integer division: MOD, DIV
3. Relational: =, <> (not eq), <, >, <=, >=
4. Logical: AND, OR, NOT

2.6 String slicing

• Must be done using a loop, python style slicing is not allowed

3. Control Structures

3.1 If

IF <condition> 
  THEN 
    <statements> 
  ELSE
    <statements>
ENDIF 

3.2 Case

CASE OF myVariable 
  <value1>: <statements>
  OTHERWISE: <statements> 
ENDCASE

3.3 For loop

// Loop on INTEGER
FOR i <- 1 to 10 STEP <increment> (optional, can be negative)
  <statement>
ENDFOR 
// Loop on STRING or ARRAY 
FOR i <- 1 to LENGTH(myString)
  <statement using myString[i]> 
ENDFOR

3.4 Conditional loops

REPEAT 
  <statements>
UNTIL <condition>

WHILE <condition> DO 
  <statements>
ENDWHILE 

4 Useful stuff

4.1 Procedures (does not return anything)

PROCEDURE myProcedure(param1: INTEGER, param2: INTEGER)
  <statements>
ENDPROCEDURE 

CALL myProcedure(1, 2)

4.2 Function

FUNCTION myFunction(param1: INTEGER, param2: INTEGER) RETURNS INTEGER
  <statements>
  RETURN <something> 
ENDFUNCTION