Golang浮点运算[重复]

问题描述：

This question already has an answer here:

Is floating point math broken? 30 answers

How does the float arithmetic work in Go

Playground link

package main

import "fmt"

func main() {
    j := 1.021
    fmt.Println(j)
    k := j*1000
    fmt.Println(k)
    l := int(k)
    fmt.Println(l)
}

Output:
1.021
1020.9999999999999
1020

I was expecting 1021 to be printed, but I got 1020

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此问题已经存在在这里有答案： p>

浮点数学运算符被破坏了吗？ 30个答案 span> ul> div>

浮点运算在Go中如何工作 p>

游乐场链接 p>

 包main 
 
import“ fmt” \  n 
func main（）{
j：= 1.021 
 fmt.Println（j）
k：= j * 1000 
 fmt.Println（k）
l：= int（k）
 fmt.Println（l  ）
} 
 
输出：
1.021 
1020.9999999999999 
1020 
  code>  pre> 
 
 我期望打印 1021  code>  ，但我得到 1020  code>  p> 
  div>

答

Go, like everyone else, uses IEEE-754 binary floating-point arithmetic. Floating-point arithmetic is inexact for some decimal values.

References:

Floating point

IEEE floating point

Golang浮点运算[重复]

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