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# Rnd Function

Returns a random number in the range 0.0 to 1.0.

## Syntax:

    Rnd [(Expression)]

## Return value:

Double

## Parameters:

Expression: Has no effect, is ignored if provided.

The Rnd function returns decimal fractions ranging from 0 (included) to 1 (excluded) according to a uniform distribution. It uses the Mersenne Twister 19937 random-number generator. To generate random integers in a given range, use a formula like in the example below. A Randomize statement with a defined seed value can be used beforehand, if a predictable sequence of numbers is desired.

## Error codes:

5 Invalid procedure call

## Example:

    Sub ExampleRandomSelect

    Dim iVar As Integer

        iVar = Int((15 * Rnd) -2)

        Select Case iVar

            Case 1 To 5

                Print "Number from 1 to 5"

            Case 6, 7, 8

                Print "Number from 6 to 8"

            Case Is > 8 And iVar < 11

                Print "Greater than 8"

            Case Else

                Print "Outside range 1 to 10"

        End Select

    End Sub

Related Topics

Randomize Statement