pi
The mathematical constant pi (π), approximately equal to 3.14159.
Declaration
static var pi: Float16 { get }Discussion
When measuring an angle in radians, π is equivalent to a half-turn.
This value is rounded toward zero to keep user computations with angles from inadvertently ending up in the wrong quadrant. A type that conforms to the FloatingPoint protocol provides the value for pi at its best possible precision.
print(Double.pi)
// Prints "3.14159265358979"