# Floating Point or Float

## Description

* Number with a decimal point
* Used for precision
* Used for percentages, but between 0 and 1 (0 and 100%)
* Used for time

**Examples:**

*Processing:*

```java
float speed = 2.5;
```

*JavaScript:*

```javascript
var percentage = 0.25;
```

*Python:*

```python
percentage = 0.25
```

{% hint style="info" %}
Some languages have multiple types with decimal points

Example: a float in C# or Unity will need an `F` after the number in the code to tell it is a float and not something else**.** See the example below.
{% endhint %}

```csharp
float speed = 2.5F;
```

^ This is one of the more common errors - forgetting that F.

{% hint style="warning" %}
Do not use commas in your numbers!
{% endhint %}

## Shortcuts (Assignment Operators)

### Quick Math

**`+=`** means “add this”

**`-=`** means “subtract this”

**`*=`** means “multiply it by this”

**`/=`** means “divide it by this”

{% hint style="warning" %}
This updates the variable when used.
{% endhint %}

**Example:**    

*Processing, Java-based, and C-based:*

```java
float opacity = 0.5;

println(opacity);        // Prints "0.5"

opacity += 0.15;

println(opacity);        // Prints "0.65"
```

*Python:*

```python
opacity = 0.5

print(opacity)        # Prints "0.5"

opacity += 0.15

print(opacity)        # Prints "0.65"
```


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