Apple Developer Documentation

A quiet NaN (”not a number”)

• 목차

Availability

• iOS 8.0+
• macOS 10.10+
• Mac Catalyst 13.0+
• tvOS 9.0+
• watchOS 2.0+
• Xcode 8.0+

Technology

• Swift Standard Library

On This Page • Declaration  • Discussion  • Relationships

Declaration

static var nan: Double { get } 

Discussion

A NaN compares not equal, not greater than, and not less than every value, including itself. Passing a NaN to an operation generally results in NaN.