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Task/Random-numbers/FreeBASIC/random-numbers.freebasic

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+' FB 1.05.0 Win64
+
+Const pi As Double = 3.141592653589793
+Randomize
+
+' Generates normally distributed random numbers with mean 0 and standard deviation 1
+Function randomNormal() As Double
+  Return Cos(2.0 * pi * Rnd) * Sqr(-2.0 * Log(Rnd))
+End Function
+
+Dim r(0 To 999) As Double
+Dim sum As Double = 0.0
+
+' Generate 1000 normally distributed random numbers
+' with mean 1 and standard deviation 0.5
+' and calculate their sum
+For i As Integer = 0 To 999
+   r(i) = 1.0 + randomNormal/2.0
+   sum += r(i)
+Next
+
+Dim mean As Double = sum / 1000.0
+
+Dim sd As Double
+sum = 0.0
+' Now calculate their standard deviation
+For i As Integer = 0 To 999
+  sum += (r(i) - mean) ^ 2.0
+Next
+sd  = Sqr(sum/1000.0)
+
+Print "Mean is              "; mean
+Print "Standard Deviation is"; sd
+Print
+Print "Press any key to quit"
+Sleep