nikhil wrote at 04/30/2011 01:45 AM:
How do I return/print both ?
There are a few different ways. Which you choose depends on what you
are trying to do. Here is a program that you can paste into DrRacket
and run for some examples:
#lang racket
(display "\nYour original code:\n")
(let ((var `(make))
(exp '(1 2)))
(cond [(number? 2)
`(hi ,var)
`(bye ,exp)]))
(display "\nReturning a single list that includes the other two lists:\n")
(let ((var `(make))
(exp '(1 2)))
(cond [(number? 2)
`((hi ,var)
(bye ,exp))]))
(display "\nUsing \"values\" to return multiple values instead of just
one (this is usually for advanced programmers only):\n")
(let ((var `(make))
(exp '(1 2)))
(cond [(number? 2)
(values `(hi ,var)
`(bye ,exp))]))
(display "\nUsing \"printf\" to display values rather than return them
from the expression:\n")
(let ((var `(make))
(exp '(1 2)))
(cond [(number? 2)
(printf "~S\n" `(hi ,var))
(printf "~S\n" `(bye ,exp))
"this is the actual returned value"]))
(display "\nUsing \"log-debug\" to send values to the log (see DrRacket
\"View -> Show Log\" menu item):\n")
(let ((var `(make))
(exp '(1 2)))
(cond [(number? 2)
(log-debug (format "~S" `(hi ,var)))
(log-debug (format "~S" `(bye ,exp)))
"this is the actual returned value"]))
--
http://www.neilvandyke.org/
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