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# C# | Random.NextDouble() Method

The NextDouble() Method of System.Random class in C# is used to return a random floating-point number which is greater than or equal to 0.0, and less than 1.0.

Syntax:

public virtual double NextDouble();

Return Value: This method returns a double-precision floating point number which is greater than or equal to 0.0, and less than 1.0.

Below program illustrates the use of NextDouble() Method:

Example 1:

 // C# program to illustrate the // Random.NextDouble() Methodusing System;  class GFG {      // Driver code    public static void Main()    {        // Instantiate random number generator        Random rand = new Random();          // Print 10 random floating point numbers        Console.WriteLine("Printing 10 random floating point numbers");        for (int i = 0; i < 10; i++)            Console.WriteLine("{0} -> {1}", i, rand.NextDouble());    }}

Output:

Printing 10 random floating point numbers
0 -> 0.0227202852362396
1 -> 0.624568469647583
2 -> 0.0145442797870116
3 -> 0.646489209330869
4 -> 0.967497945748036
5 -> 0.839329582098559
6 -> 0.873648912121378
7 -> 0.16200648022909
8 -> 0.66018275761054
9 -> 0.0837694853934317

Example 2:

 // C# program to illustrate the // Random.NextDouble() Methodusing System;  class GFG {      // Driver code    public static void Main()    {        // Instantiate random number generator        Random rand = new Random();          // Instantiate an array of double        double[] a = new double[10];          // Store random floating point         // numbers in the array        for (int i = 0; i < 10; i++)            a[i] = rand.NextDouble();          // Print 10 random floating point numbers        Console.WriteLine("Printing 10 random "+                      "floating point numbers");          for (int i = 0; i < 10; i++)            Console.WriteLine("{0} -> {1}", i, a[i]);    }}

Output:

Printing 10 random floating point numbers
0 -> 0.853536825558886
1 -> 0.741455778359182
2 -> 0.496043408986201
3 -> 0.0975164361752181
4 -> 0.120282317567748
5 -> 0.57163705703413
6 -> 0.749181974562435
7 -> 0.684014179596684
8 -> 0.691246760865323
9 -> 0.888019556127498

Reference:

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