Permutations: Difference between revisions
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nextp=.true. |
nextp=.true. |
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end</lang> |
end</lang> |
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=={{header|FreeBASIC}}== |
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<lang freebasic>' version 07-04-2017 |
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' compile with: fbc -s console |
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' Heap's algorithm non-recursive |
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Sub perms(n As Long) |
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Dim As ULong i, j, count = 1 |
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Dim As ULong a(0 To n -1), c(0 To n -1) |
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For j = 0 To n -1 |
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a(j) = j +1 |
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Print a(j); |
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Next |
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Print " "; |
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i = 0 |
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While i < n |
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If c(i) < i Then |
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If (i And 1) = 0 Then |
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Swap a(0), a(i) |
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Else |
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Swap a(c(i)), a(i) |
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End If |
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For j = 0 To n -1 |
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Print a(j); |
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Next |
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count += 1 |
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If count = 12 Then |
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Print |
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count = 0 |
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Else |
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Print " "; |
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End If |
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c(i) += 1 |
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i = 0 |
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Else |
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c(i) = 0 |
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i += 1 |
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End If |
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Wend |
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End Sub |
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' ------=< MAIN >=------ |
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perms(4) |
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' empty keyboard buffer |
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While Inkey <> "" : Wend |
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Print : Print "hit any key to end program" |
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Sleep |
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End</lang> |
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{{out}} |
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<pre>1234 2134 3124 1324 2314 3214 4213 2413 1423 4123 2143 1243 |
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1342 3142 4132 1432 3412 4312 4321 3421 2431 4231 3241 2341</pre> |
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=={{header|GAP}}== |
=={{header|GAP}}== |
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