---
title: "round(_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/float/round(_:)"
---

# round(_:)

Rounds the value to an integral value using the specified rounding rule.

## Declaration

```swift
mutating func round(_ rule: FloatingPointRoundingRule)
```

## Parameters

- `rule`: The rounding rule to use.

## Discussion

Discussion The following example rounds a value using four different rounding rules: // Equivalent to the C 'round' function: var w = 6.5 w.round(.toNearestOrAwayFromZero) // w == 7.0

// Equivalent to the C 'trunc' function: var x = 6.5 x.round(.towardZero) // x == 6.0

// Equivalent to the C 'ceil' function: var y = 6.5 y.round(.up) // y == 7.0

// Equivalent to the C 'floor' function: var z = 6.5 z.round(.down) // z == 6.0 For more information about the available rounding rules, see the FloatingPointRoundingRule enumeration. To round a value using the default “schoolbook rounding” of .toNearestOrAwayFromZero, you can use the shorter round() method instead. var w1 = 6.5 w1.round() // w1 == 7.0

## See Also

### Rounding Values

- [rounded()](swift/float/rounded().md)
- [rounded(_:)](swift/float/rounded(_:).md)
- [round()](swift/float/round().md)