Question

How to round up a double value to 3 decimal places in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Math.Ceiling(199.1831));
            Console.WriteLine(RoundUp(199.1831, 3));
        }
        public static double RoundUp(double d, int places)
        {
            double multiplier = Math.Pow(10, Convert.ToDouble(places));

            return Math.Ceiling(d * multiplier) / multiplier;
        }
    }
}

/*
run:
    
200
199.184
 
*/

 

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Answer 2

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Math.Ceiling(199.1831));
            Console.WriteLine(Math.Ceiling(199.1831 * 1000) / 1000);
        }
    }
}

/*
run:
     
200
199.184
  
*/

 

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Answer 3

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Math.Ceiling(199.1831));
            Console.WriteLine(0.001 * Math.Ceiling(1000 * 199.1831));
        }
    }
}

/*
run:
     
200
199.184
  
*/

 

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