package format

import (
	"fmt"
	"strings"
)

// 数字变成带千分位的字符串
func NumToStringWithThousandthPercentile(number int64) string {
	s := fmt.Sprintf("%d", number)
	l := len(s)
	if l <= 3 {
		return s
	}
	r := l % 3 //前面第几位开始加入千分位
	b := strings.Builder{}
	for i := 0; i < l; i++ {
		b.WriteString(string(s[i]))
		if i+1 == r && i != l-1 {
			b.WriteString(",")
			r += 3
		}
	}
	return b.String()
}