「A Tour of Go」でGo言語を学ぶ(~#10) ref: http://qiita.com/items/a5b514b289997b50a8bb

file1.txt

-1 1.2246467991473515e-16

file2.go

func parameter(radius,angle float64) (float64,float64) {
    x := radius * math.Cos(angle)
    y := radius * math.Sin(angle)
    return x,y
}

func2.go

package main

import (
    "fmt"
    "math"
)

func parameter(radius,angle float64) (x,y float64) {
    x = radius * math.Cos(angle)
    y = radius * math.Sin(angle)
    return
}

func main() {
    fmt.Println(parameter(1.0,math.Pi))
}