Golang浮点运算[重复]

Question

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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Answer 1

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