using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Utils.Datas
{
	public class NumToStringUtil
	{
		/// <summary>
		/// 小数位最多N位
		/// </summary>
		public static string GetPointAtMost(decimal num, int places = 2)
		{
			var s = GetStandardPoint(num, places);
			if (!s.EndsWith("0"))
				return s;
			int zeroLength = 1;
			for (int i = 1; i < places; i++) {
				if (s.ElementAt(s.Length - zeroLength - 1) != '0')
					break;
				zeroLength++;
			}
			if (zeroLength == places)
				return s.Substring(0, s.Length - zeroLength - 1);
			return s.Substring(0, s.Length - zeroLength);
		}

		/// <summary>
		/// N位小数
		/// </summary>
		public static string GetStandardPoint(decimal num, int places = 2)
		{
			if (places < 1)
				places = 2;
			return num.ToString("F" + places);
		}
	}
}