package utils

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

func Round(f float64, n int) float64 {
	pow10 := math.Pow10(n)
	return math.Trunc((f+0.5/pow10)*pow10) / pow10
}

func GenValidateCode(width int) string {
	numeric := [9]byte{1, 2, 3, 4, 5, 6, 7, 8, 9}
	r := len(numeric)
	rand.Seed(time.Now().UnixNano())

	var sb strings.Builder
	for i := 0; i < width; i++ {
		fmt.Fprintf(&sb, "%d", numeric[rand.Intn(r)])
	}
	return sb.String()
}
