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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Jensens-Device/REXX/jensens-device.rexx Normal file
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/*REXX program demonstrates Jensen's device (via call subroutine, and args by name). */
parse arg d . /*obtain optional argument from the CL.*/
if d=='' | d=="," then d= 100 /*Not specified? Then use the default.*/
numeric digits d /*use D decimal digits (9 is default)*/
say 'using ' d " decimal digits:" /*display what's being used for digits.*/
say
say sum( i, 1, 100, "1/i" ) /*invoke SUM (100th harmonic number).*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
sum: procedure; parse arg j,start,finish,exp; $= 0
interpret 'do' j "=" start 'to' finish "; $=$+" exp '; end'
/*comment ──── ═ ─── ═════ ──── ══════ ────────── ═══ ───────── */
/*comment lit var lit var lit var literal var literal */
return $