---
title: "maximum(_:_:)"
framework: swift
role: symbol
role_heading: Type Method
path: "swift/double/maximum(_:_:)"
---

# maximum(_:_:)

Returns the greater of the two given values.

## Declaration

```swift
static func maximum(_ x: Self, _ y: Self) -> Self
```

## Parameters

- `x`: A floating-point value.
- `y`: Another floating-point value.

## Return Value

Return Value The greater of x and y, or whichever is a number if the other is NaN.

## Discussion

Discussion This method returns the maximum of two values, preserving order and eliminating NaN when possible. For two values x and y, the result of maximum(x, y) is x if x > y, y if x <= y, or whichever of x or y is a number if the other is a quiet NaN. If both x and y are NaN, or either x or y is a signaling NaN, the result is NaN. Double.maximum(10.0, -25.0) // 10.0 Double.maximum(10.0, .nan) // 10.0 Double.maximum(.nan, -25.0) // -25.0 Double.maximum(.nan, .nan) // nan The maximum method implements the maxNum operation defined by the IEEE 754 specification.

## See Also

### Comparing Values

- [Floating-Point Operators for Double](swift/floating-point-operators-for-double.md)
- [isEqual(to:)](swift/double/isequal(to:).md)
- [isLess(than:)](swift/double/isless(than:).md)
- [isLessThanOrEqualTo(_:)](swift/double/islessthanorequalto(_:).md)
- [isTotallyOrdered(belowOrEqualTo:)](swift/double/istotallyordered(beloworequalto:).md)
- [minimum(_:_:)](swift/double/minimum(_:_:).md)
- [minimumMagnitude(_:_:)](swift/double/minimummagnitude(_:_:).md)
- [maximumMagnitude(_:_:)](swift/double/maximummagnitude(_:_:).md)