C#DECIMAL结构取整方法总结

C#DECIMAL结构取整方法总结

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

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//Floor向负无穷方向舍入为最接近的整数
Console.WriteLine(decimal .Floor(-1.3m)); //-2
Console.WriteLine(decimal .Floor (3.5m)); //3
Console.WriteLine(decimal .Floor (4m)); //4

//Truncate向零方向舍入为整数
Console.WriteLine(decimal.Truncate(-1.3m));//-1
Console.WriteLine(decimal.Truncate (3.5m));//3
Console.WriteLine(decimal.Truncate (4m)); //4

//如果想实现四舍五入，则必须用下面的技巧，保留到小数点后2位，就用100，保留到小数点后3位就用1000，依次类推
decimal a = 8.335m,b=8.345m;
Console.WriteLine(decimal .Truncate (a*100+0.5m)/100); //8.34
Console.WriteLine (decimal .Truncate (b*100+0.5m)/100); //8.35

//总结，System.Double(double)和System.Single(float)结构都没有这2种方法，所以一般用decimal来实现取整
}
}
}