language_ref/reference/functions/maths/func_maths_rnddouble.rst

.. _func_maths_rnddouble:

=========
RndDouble
=========

RndDouble - 

Description
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.. code-block:: blitzmax

    RndDouble!()

Generate random double

Parameters
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Return Values
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A random double in the range 0 (inclusive) to 1 (exclusive)

Examples
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.. code-block:: blitzmax

    ' RndDouble.bmx
    ' Two players take turns shooting at a target. The first hit wins.
    ' Player 1 hits 30% of the time, player 2 hits 40%.
    ' What is the probability that player 1 wins?
    
    Function winner()   ' play game once, return winner 1 or 2
        Repeat
            If RndDouble() < 0.3 Then Return 1
            If RndDouble() < 0.4 Then Return 2
        Forever
    End Function
    
    Local count[3]
    
    trials = 1000000
    
    For n = 1 to trials
        count[ winner() ] :+ 1
    Next
    
    Print "Estimated probability = " + ( Double( count[1] ) / Double( trials ) )
    Print
    Print "    Exact probability = " + ( 15.0 / 29.0 )
    
    Input 
     End

See Also
========