dtkp51520
2018-10-31 00:41
浏览 32
已采纳

Go中的实数[重复]

This question already has an answer here:

How to work with real numbers in Go?

For instance:

(627.71/640.26)^(1/30) = 0.999340349 --> correct result

but with Go:

fmt.Print(math.Pow((627.71 / 640.26), (1 / 30))) = 1 --> wrong
</div>
  • 点赞
  • 写回答
  • 关注问题
  • 收藏
  • 邀请回答

1条回答 默认 最新

  • doulan8152 2018-10-31 00:45
    已采纳

    Use floating-point (real), not integer, division. For example,

    package main
    
    import (
        "fmt"
        "math"
    )
    
    func main() {
        fmt.Print(math.Pow((627.71 / 640.26), (1.0 / 30.0)))
    }
    

    Playground: https://play.golang.org/p/o7uVw9doaMu

    Output:

    0.999340348749526
    

    package main
    
    import "fmt"
    
    func main() {
        fmt.Println(1 / 30)     // integer division
        fmt.Println(1.0 / 30.0) // floating-point division
    }
    

    Playground: https://play.golang.org/p/VW9vilCC9M8

    Output:

    0
    0.03333333333333333
    

    The Go Programming Language Specification

    Integer literals

    Floating-point literals

    Arithmetic operators

    Integer operators

    For two integer values x and y, the integer quotient q = x / y and remainder r = x % y satisfy the following relationships:

    x = q*y + r  and  |r| < |y|
    

    with x / y truncated towards zero ("truncated division").

    点赞 打赏 评论

相关推荐