Generate a Random Floating Point Number between two Numbers

The Random.NextDouble() method returns a random number between 0.0 and 1.0. However what if you want to specify the upper and lower limits and then generate a random double number? Here’s some code I had written a couple of months ago to generate a random double number between two numbers:

C#

class Program
{
    static void Main(string[] args)
    {
        double dr = GenRand(1.0, 20.0);
        Console.WriteLine(dr);
        Console.ReadLine();
    }

    static double GenRand(double one, double two)
    {
        Random rand = new Random();
        return one + rand.NextDouble() * (two - one);
    }
}

VB.NET

Friend Class Program
 Sub Main(ByVal args() As String)
     Dim dr As Double = GenRand(1.0, 20.0)
     Console.WriteLine(dr)
     Console.ReadLine()
 End Sub

Shared Function GenRand(ByVal one As Double, ByVal two As Double) As Double
     Dim rand As New Random()
     Return one + rand.NextDouble() * (two - one)
End Function
End Class

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal