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math/big: better documentation for Rat.Float64

R=adonovan, r
CC=golang-dev
https://golang.org/cl/11961043
This commit is contained in:
Robert Griesemer 2013-07-29 13:06:34 -07:00
parent 64db2ec915
commit 5bd61e0603

View File

@ -164,8 +164,9 @@ func quotToFloat(a, b nat) (f float64, exact bool) {
}
// Float64 returns the nearest float64 value for x and a bool indicating
// whether f represents x exactly. The sign of f always matches the sign
// of x, even if f == 0.
// whether f represents x exactly. If the magnitude of x is too large to
// be represented by a float64, f is an infinity and exact is false.
// The sign of f always matches the sign of x, even if f == 0.
func (x *Rat) Float64() (f float64, exact bool) {
b := x.b.abs
if len(b) == 0 {