# Inputs and constants

> What the person running the script may change.

Source: https://algobarsx.com/docs/inputs-and-constants/

An `input` becomes a setting in the script's panel. Its type comes from its default value, so `input risk = 1%` is a percent and `input higher_tf = 4h` is a bar size. A `const` is fixed.

```algobarsx
input fast = 20, label: "Fast length", min: 2, max: 500, group: "Trend"
input source = close, label: "Source"
input higher_tf = 4h, label: "Higher timeframe"
input session = "london", options: ["london", "new_york", "asia"]
input risk = 1%, min: 0.1%, max: 5%, step: 0.1%
input show_zones = true, group: "Display"
input zone_color = blue.fade(70), group: "Display", visible_if: show_zones

const RISK_CAP = 2%
```

| Option | What it does |
| --- | --- |
| `label` | The name shown in the panel. |
| `min`, `max`, `step` | Limits and step size. |
| `options` | A fixed list of choices. |
| `group` | Groups inputs under a heading. |
| `visible_if` | Shows this input only when another one is on. |

An input nobody reads is flagged as a hint ([AS0601](https://algobarsx.com/docs/diag-hints/#AS0601)).