Loops/With multiple ranges: Difference between revisions
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(→{{header|TXR}}: New section.) |
(→{{header|TXR}}: Make macro work harder, so programmer just specifies loop initial and final values and step.) |
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<syntaxhighlight lang="txrlisp">(defmacro mfor (:form f (var . range-triplets) . forms) |
<syntaxhighlight lang="txrlisp">(defmacro mfor (:form f (var . range-triplets) . forms) |
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(with-gensyms (body) |
(with-gensyms (body toval stepval test) |
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^(let (,var) |
^(let (,var) |
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(flet ((,body () ,*forms)) |
(flet ((,body () ,*forms)) |
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,*(append-each ((rt (tuples 3 range-triplets))) |
,*(append-each ((rt (tuples 3 range-triplets))) |
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(mac-param-bind f ( |
(mac-param-bind f (from to step) rt |
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^((set ,var , |
^((set ,var ,from) |
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(for ( |
(for* ((,toval ,to) |
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(,stepval ,step) |
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(,test (if (<= ,var ,toval) |
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(fun <=) (fun >=)))) |
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([,test ,var ,toval]) |
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((inc ,var ,stepval)) |
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(,body))))))))) |
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(let ((prod 1) (sum 0) |
(let ((prod 1) (sum 0) |
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(x 5) (y -5) (z -2) |
(x 5) (y -5) (z -2) |
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(one 1) (three 3) (seven 7)) |
(one 1) (three 3) (seven 7)) |
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(mfor (j (- three) |
(mfor (j (- three) (expt 3 3) three |
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(- seven) |
(- seven) seven x |
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555 |
555 (- 550 y) 1 |
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22 |
22 -28 (- three) |
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1927 |
1927 1939 1 |
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x |
x y z |
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(expt 11 x) |
(expt 11 x) (succ (expt 11 x)) 1) |
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(upd sum (+ (abs j))) |
(upd sum (+ (abs j))) |
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(if (and (< (abs prod) (ash 1 27)) |
(if (and (< (abs prod) (ash 1 27)) |
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<pre>sum = 348173; prod = -793618560</pre> |
<pre>sum = 348173; prod = -793618560</pre> |
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=={{header|uBasic/4tH}}== |
=={{header|uBasic/4tH}}== |
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