Declaring Variables and Arrays

Introduction to Declaring Variables and Arrays in Pseudonaja

This guide is going to take you through the process of basic declaration of variables in Pseudonaja.

Basic Variables

To use variables in Pseudonaja we first need to declare the variable. This can be done using the following command:

DECLARE <variable name> : <data type>

An example of this is:

DECLARE num1 : INTEGER

You can also use commas to DECLARE multiple variables

DECLARE num1, num2, num3 : INTEGER

Available data types:

Datatype Command	Type
INTEGER	A single integer number
REAL	A single float / real number
BOOLEAN	A binary TRUE or FALSE value
CHAR	A single character
STRING	A string of multiple characters
ARRAY	An array of fixed length of a particular data type

To assign a value to a variable, instead of an = sign, an <- is used instead, after the variable has been declared.

num1 <- 3

Arrays

In pseudocode you declare arrays slightly differently:

DECLARE <array name> : ARRAY [<lower bound>:<upper bound>] OF <data type>

An example of this is:

DECLARE myArray : ARRAY[0:100] OF INTEGER

Unlike lists in python arrays can only consist of a single data type as well as a fixed length.

Two dimensional arrays are declared as follows:

DECLARE <array name> ARRAY [<1ower bound 1>:<upper bound 1>, <1ower bound 1>:<upper bound 2>] OF <data type>

An example of this is:

DECLARE my2DArray ARRAY [0:100, 0:1] OF CHAR

Accessing Arrays

To access a 1D array:

DECLARE myArray : ARRAY[0:100] OF INTEGER

myArray[19] <- 29

To access a 2D array:

DECLARE my2DArray ARRAY [0:100, 0:1] OF CHAR

my2DArray[12, 1] <- 'B'

Where the first value within the assignment statement is the row to be accessed, and the second value is the column to be accessed.