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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Call-a-function/REXX/call-a-function-3.rexx Normal file
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/*╔════════════════════════════════════════════════════════════════════╗
║ Calling a function with optional arguments. ║
║ ║
║ Note that not passing an argument isn't the same as passing a null ║
║ argument (a REXX variable whose value is length zero). ║
╚════════════════════════════════════════════════════════════════════╝*/
x= 12; w= x/2; y= x**2; z= x//7 /* z is x modulo seven. */
say 'sum of w, x, y, & z=' SumIt(w,x,y,,z) /*pass five args, the 4th arg is "null"*/
exit /*stick a fork in it, we're all done. */
SumIt: procedure
$= 0 /*initialize the sum to zero. */
do j=1 for arg() /*obtain the sum of a number of args. */
if arg(j,'E') then $= $ + arg(j) /*the Jth arg may have been omitted. */
end /*j*/
return $