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Diffstat (limited to 'ipl/procs/xrotate.icn')
| -rw-r--r-- | ipl/procs/xrotate.icn | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/ipl/procs/xrotate.icn b/ipl/procs/xrotate.icn new file mode 100644 index 0000000..6070390 --- /dev/null +++ b/ipl/procs/xrotate.icn @@ -0,0 +1,38 @@ +############################################################################ +# +# File: xrotate.icn +# +# Subject: Procedure to rotate values in list or record +# +# Author: Ralph E. Griswold +# +# Date: April 30, 1993 +# +############################################################################ +# +# This file is in the public domain. +# +############################################################################ +# +# xrotate(X, i) rotates the values in X right by one position. It works +# for lists and records. +# +# This procedure is mainly interesting as a recursive version of +# +# x1 :=: x2 :=: x3 :=: ... xn +# +# since a better method for lists is +# +# push(L, pull(L)) +# +############################################################################ + +procedure xrotate(X, i) + + /i := 1 + + X[i] :=: xrotate(X, i + 1) + + return X[i] + +end |