...
Run Format

Source file src/math/hypot.go

     1	// Copyright 2010 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package math
     6	
     7	/*
     8		Hypot -- sqrt(p*p + q*q), but overflows only if the result does.
     9	*/
    10	
    11	// Hypot returns Sqrt(p*p + q*q), taking care to avoid
    12	// unnecessary overflow and underflow.
    13	//
    14	// Special cases are:
    15	//	Hypot(±Inf, q) = +Inf
    16	//	Hypot(p, ±Inf) = +Inf
    17	//	Hypot(NaN, q) = NaN
    18	//	Hypot(p, NaN) = NaN
    19	func Hypot(p, q float64) float64
    20	
    21	func hypot(p, q float64) float64 {
    22		// special cases
    23		switch {
    24		case IsInf(p, 0) || IsInf(q, 0):
    25			return Inf(1)
    26		case IsNaN(p) || IsNaN(q):
    27			return NaN()
    28		}
    29		if p < 0 {
    30			p = -p
    31		}
    32		if q < 0 {
    33			q = -q
    34		}
    35		if p < q {
    36			p, q = q, p
    37		}
    38		if p == 0 {
    39			return 0
    40		}
    41		q = q / p
    42		return p * Sqrt(1+q*q)
    43	}
    44	

View as plain text