rounded(_:)

Declaration

func rounded(_ rule: FloatingPointRoundingRule) -> Self

Parameters

• rule:

  The rounding rule to use.

Return Value

The integral value found by rounding using rule.

Discussion

The following example rounds a value using four different rounding rules:

let x = 6.5

// Equivalent to the C 'round' function:
print(x.rounded(.toNearestOrAwayFromZero))
// Prints "7.0"

// Equivalent to the C 'trunc' function:
print(x.rounded(.towardZero))
// Prints "6.0"

// Equivalent to the C 'ceil' function:
print(x.rounded(.up))
// Prints "7.0"

// Equivalent to the C 'floor' function:
print(x.rounded(.down))
// Prints "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 rounded() method instead.

print(x.rounded())
// Prints "7.0"