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# Rnd Function

0 から 1 の間の乱数を返します。

## 構文:

    Rnd [(Expression)]

## 戻り値:

Double

## パラメーター:

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 無効なプロシージャー呼び出しです

## 例:

    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

関連項目

Randomize Statement