uint32，uint16 类型开平方，采用二分法，避免转 float64带来的效率低下

UintSqrt.go

package main

import (
	"fmt"
	"math"
)

// Uint32Sqrt uint32开平方，返回 uint16
func Uint32Sqrt(n uint32) uint16 {
	res := int(n)
	bNum := res
	sNum := 0
	for {
		thisNum := (bNum + sNum) / 2
		ii := thisNum * thisNum
		ipi := (thisNum + 1) * (thisNum + 1)
		isi := (thisNum - 1) * (thisNum - 1)
		if ii == res || (ii < res && ipi > res) || (ii > res && isi < res) {
			return uint16(thisNum)
		} else if ii > res {
			bNum = thisNum
		} else if ii < res {
			sNum = thisNum
		}
	}
}

// Uint16Sqrt uint16开平方，返回 uint8
func Uint16Sqrt(n uint16) uint8 {
	res := int(n)
	bNum := res
	sNum := 0
	for {
		thisNum := (bNum + sNum) / 2
		ii := thisNum * thisNum
		ipi := (thisNum + 1) * (thisNum + 1)
		isi := (thisNum - 1) * (thisNum - 1)
		if ii == res || (ii < res && ipi > res) || (ii > res && isi < res) {
			return uint8(thisNum)
		} else if ii > res {
			bNum = thisNum
		} else if ii < res {
			sNum = thisNum
		}
	}
}

// Uint32ToUint8 uint32开四次方，返回 uint8
func Uint32ToUint8(n uint32) uint8 {
	return uint16Sqrt(uint32Sqrt(n))
}