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September 2017 Update

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Ingy döt Net 2017-09-23 10:01:46 +02:00
parent bba7bfd280
commit ba8067c3b7
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26
Task/Higher-order-functions/REXX/higher-order-functions.rexx
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@ -1,18 +1,12 @@
/*REXX program demonstrates passing a function (as a name) to another function. */
n=3735928559
funcName = 'fib' ; q= 10; call someFunk funcName, q; call tell
funcName = 'fact' ; q= 6; call someFunk funcName, q; call tell
funcName = 'square' ; q= 13; call someFunk funcName, q; call tell
funcName = 'cube' ; q= 3; call someFunk funcName, q; call tell
q=721; call someFunk 'reverse',q; call tell
say copies('═', 30) /*display a nice separator fence */
say 'done as' d2x(n). /*prove that variable N is still intact*/
/*REXX program demonstrates the passing of a name of a function to another function. */
call function 'fact' , 6; say right( 'fact{'$"} = ", 30) result
call function 'square' , 13; say right( 'square{'$"} = ", 30) result
call function 'cube' , 3; say right( 'cube{'$"} = ", 30) result
call function 'reverse', 721; say right( 'reverse{'$"} = ", 30) result
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
cube: return n**3
fact: !=1; do j=2 to n; !=!*j; end; return !
fib: if n<2 then return n; _=0; a=0; b=1; do j=2 to n; _=a+b; a=b; b=_; end; return _
reverse: return 'REVERSE'(n)
someFunk: procedure; arg ?,n; signal value (?); say result 'result'; return
square: return n**2
tell: say right(funcName'('q") = ",20) result; return
cube: return $**3
fact: procedure expose $; !=1; do j=2 to $; !=!*j; end; return !
function: arg ?.; parse arg ,$; signal value (?.)
reverse: return 'REVERSE'($)
square: return $**2