41 lines
1.2 KiB
VB.net
41 lines
1.2 KiB
VB.net
Module Module1
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Dim sq As Integer() = {1, 4, 9, 16, 25, 36, 49, 64, 81}
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Function isOne(x As Integer) As Boolean
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While True
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If x = 89 Then Return False
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Dim t As Integer, s As Integer = 0
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Do
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t = (x Mod 10) - 1 : If t >= 0 Then s += sq(t)
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x \= 10
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Loop While x > 0
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If s = 1 Then Return True
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x = s
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End While
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Return False
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End Function
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Sub Main(ByVal args As String())
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Const Max As Integer = 10_000_000
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Dim st As DateTime = DateTime.Now
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Console.Write("---Happy Numbers---" & vbLf & "The first 8:")
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Dim i As Integer = 1, c As Integer = 0
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While c < 8
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If isOne(i) Then Console.Write("{0} {1}", If(c = 0, "", ","), i, c) : c += 1
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i += 1
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End While
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Dim m As Integer = 10
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While m <= Max
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Console.Write(vbLf & "The {0:n0}th: ", m)
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While c < m
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If isOne(i) Then c += 1
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i += 1
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End While
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Console.Write("{0:n0}", i - 1)
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m = m * 10
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End While
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Console.WriteLine(vbLf & "Computation time {0} seconds.", (DateTime.Now - st).TotalSeconds)
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End Sub
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End Module
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