小编Wil*_*hih的帖子

我遇到了 Golang big.Float 计算的一些有趣问题。

问题是

10001000100010001000100010001000100010001000100015.5533 / 1000000000000000000

= 10001000100010001000100010001000.1000100010001000155533

然而，big.Float给出了“10001000100010001000100010001000.1000100010001000155532999999999999999999999999999999999999999999999999999999999999999 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 99999999999999999999999999999999999999999999999999999999999999999999997”

代码：

var prec uint = 1024 // 512
dec, _ := new(big.Float).SetPrec(prec).SetString("1000000000000000000")
f, _ := new(big.Float).SetPrec(prec).SetString("10001000100010001000100010001000100010001000100015.5533")
q := f.Quo(f, dec)

fmt.Printf("Percision: %d\n", prec)
fmt.Printf("Quotient: %s\n", q.Text('f', -1))

结果：

Percision: 1024
Quotient: 10001000100010001000100010001000.10001000100010001555329999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997

更令人困惑的部分是，如果我设置 prec = 512（较小的精度），它会产生正确的结果。

Percision: 512
Quotient: 10001000100010001000100010001000.1000100010001000155533

有人知道我的代码有什么问题或者如何配置 big.Float 以获得预期结果吗？

谢谢大家！