Csharp/C Sharp/Development Class/Round

Round down a number

using System;
using System.Data;
using System.Text.RegularExpressions;
class Class1{
        static void Main(string[] args){
      Console.WriteLine(RoundDown(.4));
      Console.WriteLine(RoundDown(.5));
      Console.WriteLine(RoundDown(.6));
      Console.WriteLine(RoundDown(1.4));
      Console.WriteLine(RoundDown(1.5));
      Console.WriteLine(RoundDown(1.6));
      Console.WriteLine(RoundDown(2.4));
      Console.WriteLine(RoundDown(2.5));
      Console.WriteLine(RoundDown(2.6));
      Console.WriteLine(RoundDown(3.4));
      Console.WriteLine(RoundDown(3.5));
      Console.WriteLine(RoundDown(3.6));
        }
    public static double RoundDown(double valueToRound)
    {
      double floorValue = Math.Floor(valueToRound);
      if ((valueToRound - floorValue) > .5)
      {
        return (floorValue + 1);
      }
      else
      {
        return (floorValue);
      }
    }
}

Rounding a Floating Point Value

using System;
using System.Data;
using System.Text.RegularExpressions;
class Class1{
        static void Main(string[] args){
      int X = (int)Math.Round(2.5555);
      Console.WriteLine(X);
      Console.WriteLine(Math.Round(2.5555, 2));
      Console.WriteLine(Math.Round(2.444444,3));
      Console.WriteLine(Math.Round(2.666666666666666666666666666660001));
      Console.WriteLine(Math.Round(2.4444444444444444444444440001));
      Console.WriteLine(Math.Round(.5));
      Console.WriteLine(Math.Round(1.5));
      Console.WriteLine(Math.Round(2.5));
      Console.WriteLine(Math.Round(3.5));
      Console.WriteLine();
      
      Console.WriteLine(Math.Floor(.5));
      Console.WriteLine(Math.Floor(1.5));
      Console.WriteLine(Math.Floor(2.5));
      Console.WriteLine(Math.Floor(3.5));
      Console.WriteLine();
      
      Console.WriteLine(Math.Ceiling(.5));
      Console.WriteLine(Math.Ceiling(1.5));
      Console.WriteLine(Math.Ceiling(2.5));
      Console.WriteLine(Math.Ceiling(3.5));  
      Console.WriteLine();
        }
}

Round up a number

using System;
using System.Data;
using System.Text.RegularExpressions;
class Class1{
        static void Main(string[] args){
      Console.WriteLine(RoundUp(.4));
      Console.WriteLine(RoundUp(.5));
      Console.WriteLine(RoundUp(.6));
      Console.WriteLine(RoundUp(1.4));
      Console.WriteLine(RoundUp(1.5));
      Console.WriteLine(RoundUp(1.6));
      Console.WriteLine(RoundUp(2.4));
      Console.WriteLine(RoundUp(2.5));
      Console.WriteLine(RoundUp(2.6));
      Console.WriteLine(RoundUp(3.4));
      Console.WriteLine(RoundUp(3.5));
      Console.WriteLine(RoundUp(3.6));
        }
    public static double RoundUp(double valueToRound)
    {
      return (Math.Floor(valueToRound + 0.5));
    }
}