# Basic 1

In this section, you will find a step by step to manipulate basic inputs on Ritchie.

# Basic 1: Inputs

## Objective

On this tutorial, the idea is to teach you how to create a formula on Ritchie that will **sum two positive numbers**.

Command suggestion:

`rit math sum numbers`

## Inputs

This formula needs to contain (at least) those two inputs parameters, see below:

- Number one (
`RIT_NUMBER_ONE`

). - Number two (
`RIT_NUMBER_TWO`

).

## Step by step

The formula needs to follow the next steps:

- Extract all inputs parameters.
- Convert inputs to integers (there is currently no
**integer**`type`

in inputs config.json file). - Sum both numbers.
- Return the result on the terminal.

Well done! You’ve completed the first task!

## Improvement suggestions

If you want to play a little more, here are some suggestions:

- Add a validation of the input parameters to return an error to the user if the parameter is not an integer.
- Allow the user to sum negative numbers with positive ones.
- Allow the user to digit decimals in addition to integers.

**Next steps**

👉 If you’ve completed the first tutorial, let’s go to the **basic 2 task**!

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Last modified April 19, 2021: New menu - english version (#58) (e6a49551)