> For the complete documentation index, see [llms.txt](https://codehs.gitbook.io/apjava/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://codehs.gitbook.io/apjava/basic-java/casting.md).

# Casting

Casting allows us to change a variable's type to better suit our needs.

## How Casting Works

Lets say we want to turn a double into an integer, or an integer into a double.

To change a variable's type we just add the type in between parentheses to cast it.

Consider the following:

```java
int doubleToInt = (int)10.95;
// This will become '10'
```

### Casting an Integer to a Double

To cast an integer value to a double we add `(double)` in front of the variable.

```java
int intVal = 10;

// Our 'doubleVal' variable is now '10.0'
double doubleVal = (double)intVal;
```

### Casting a Double to an Integer

To cast a double to an integer we add `(int)` in front of the variable. It is important to remember our new integer value will truncate the decimal.

```java
double doubleVal = 7.4;

// Our 'intVal' variable is now '7'
int intVal = (int)doubleVal;
```

## Division with Casting

If we divide two integers, even if we are setting them to a double, we will always be returned an integer.

```java
int currResidents = 50;
int floorTotal = 56;

double average = floorTotal / currResidents;
// 'average' will return the value '1'
```

We can get the correct answer by casting one of the variables to a double.

```java
int currResidents = 50;
int floorTotal = 56;

double average = (double)floorTotal / currResidents;
// We now have the value of '1.12'
```