//内置函数的写法 //网上零售价和折扣价在计算结束需要进行进位，规则如下： //个位为1,2,3,4进位到5，例如计算后的价格为1201，则价格为1205； //个位为6,7,8,9进位到0，例如计算后的价格为1209.则价格为1210； public
static string ChangePrice(double
price) { int
changed = 0; int
m = (int)Math.Round(price); int
n = (int)Math.Floor(price / 10); int
d = m - n * 10; if
(0 < d && d <= 4) { changed = n * 10 + 5; } else
if (5 < d && d <= 9) { changed = n * 10 + 10; } else { changed = m; } return
changed + ""; }//算法的写法 public
static string ChangePrice(double
price) { int
changed = 0;//改变后的值 int
m = 0;//四舍五入取整 int
n = 0;//取整数 double
temp = price; if
(temp.ToString().IndexOf(‘.‘) > -1) { string
strTemp = temp.ToString(); strTemp = strTemp.Substring(0, strTemp.IndexOf(‘.‘)); n = int.Parse(strTemp) / 10;//取整数 m = (int)Math.Round(temp);//四舍五入取整数 int
d = m - n * 10; if
(0 < d && d <= 4) { changed = n * 10 + 5; } else
if (5 < d && d <= 9) { changed = n * 10 + 10; } else { changed = m; } } else { string
TempAgain = (temp / 10).ToString(); if
(TempAgain.IndexOf(‘.‘) > -1) { TempAgain = TempAgain.Substring(0, TempAgain.IndexOf(‘.‘)); n = int.Parse(TempAgain); m = int.Parse(temp.ToString()); int
d = m - n * 10; if
(0 < d && d <= 4) { changed = n * 10 + 5; } else
if (5 < d && d <= 9) { changed = n * 10 + 10; } else { changed = m; } } else { n = int.Parse(TempAgain); m = int.Parse(temp.ToString()); int
d = m - n * 10; if
(0 < d && d <= 4) { changed = n * 10 + 5; } else
if (5 < d && d <= 9) { changed = n * 10 + 10; } else { changed = m; } } } return
changed + ""; } |
四舍五入的一些简单写法（利用内置函数，算法2种写法）,布布扣,bubuko.com
原文：http://www.cnblogs.com/it888/p/3760963.html