# Declaring Variables and Arrays

{% hint style="info" %}
This guide is going to take you through the process of basic declaration of variables in Pseudonaja.
{% endhint %}

### 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
```

{% hint style="info" %}
You can also use commas to DECLARE multiple variables
{% endhint %}

```
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 |

{% hint style="warning" %}
To assign a value to a variable, instead of an = sign, an <- is used instead, after the variable has been declared.
{% endhint %}

```
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
```

{% hint style="warning" %}
Unlike lists in python arrays can only consist of a single data type as well as a fixed length.
{% endhint %}

**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. &#x20;


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://pseudonajadocs.gitbook.io/editor/guides/declaring-variables-and-arrays.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.