将total块钱随机分给num个人，最大值maxVal，最小值minVal。float64的精度问题？

randMoney.go

package main

import (
	"fmt"
	"math/rand"
	"strconv"
	"time"
)

type RandMoney struct {
	num                   int
	total, minVal, maxVal float64
}

func (r *RandMoney) tmpArr() []int {
	min := int(r.minVal * 100)
	max := int(r.maxVal * 100)
	if min == 0 {
		min += 1
	}
	initMin := min
	initMax := max
	total := int(r.total * 100)
	arr := make([]int, r.num)

	cInt := make(chan int)
	defer close(cInt)
	go func() {
		for i := 0; i < r.num; i++ {
			time.Sleep(1 * time.Nanosecond)
			cInt <- randRange(min, max)
		}
	}()

	for i := 0; i < r.num; i++ {
		rnd := <-cInt
		arr[i] = rnd
		total -= rnd
	}
	for {
		if total == 0 {
			return arr
		}

		pos := randRange(0, r.num)
		if total > 0 {
			if arr[pos]+1 <= int(initMax) {
				arr[pos] += 1
				total -= 1
			}
		} else {
			if arr[pos]-1 >= int(initMin) {
				arr[pos] -= 1
				total += 1
			}
		}
	}
}

func (r *RandMoney) float64Arr() []float64 {
	tmparr := r.tmpArr()
	arr := make([]float64, r.num)
	// var tmpT float64
	for i := 0; i < r.num; i++ {
		tmpf := fmt.Sprintf("%.2f", float64(tmparr[i])/100)
		f, _ := strconv.ParseFloat(tmpf, 10)
		// tmpT += f
		arr[i] = f
	}
	// arr[r.num-1] = r.total - tmpT
	return arr
}

func randRange(min, max int) int {
	rand.Seed(time.Now().UnixNano())
	return rand.Intn(max-min) + min
}

func main() {
	r := RandMoney{
		num:    100,
		total:  50,
		minVal: 0,
		maxVal: 10,
	}
	start := time.Now()
	arr := r.float64Arr()
	fmt.Println("generate array tooks ", time.Now().Sub(start))
	var t float64
	for _, f := range arr {
		t += f
	}
	fmt.Println(arr)
	fmt.Println("sum float64: ", int(t))
}