C# 四舍五入 进一法 直接取整 带小数位数

[一篮饭特稀原创，转载请注明出处http://www.cnblogs.com/wanghafan/archive/2012/05/18/2508113.html]

四舍五入

View Code 
1         public static decimal Round(decimal d, decimal unit)
2         {
3             decimal rm = d % unit;
4             decimal result = d - rm;
5             if (rm >= unit / 2)
6                 result += unit;
7             return result;
8         }

 

进一法

View Code 
1         public static decimal Jinyi(decimal d, decimal unit)
2         {
3             decimal rm = d % unit;
4             decimal result = d - rm;
5             if (rm > 0)
6                 result += unit;
7             return result;
8         }

 

直接取整

View Code 
1         public static decimal Quzheng(decimal d, decimal unit)
2         {
3             decimal rm = d % unit;
4             decimal result = d - rm;
5             return result;
6         }

 

 

 

调用方式

View Code 
 1 int cou = 3;
 2 string uit = string.Empty;
 3 int cou = int.Parse(dt.Rows[0]["小数位数"].ToString());
 4 if (cou == 0)
 5 {
 6     uit = "1";
 7 }
 8 else
 9 {
10     uit = "0.";
11     for (int i = 1; i < cou; i++) 
12     uit += "0";
13     uit += "1";
14 }
15  
16 Jinyi(num, decimal.Parse(uit));
17 Round(num, decimal.Parse(uit));
18 Quzheng(num, decimal.Parse(uit));

 

 

 

posted @ 2012-05-18 17:22  一篮饭特稀  阅读(2669)  评论(1)  编辑  收藏  举报