Re: return expressions

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2 total messages Started by sbw@naucse.UUCP Mon, 10 Jul 1989 21:39

#43

Author: sbw@naucse.UUCP
Date: Mon, 10 Jul 1989 21:39

44 lines
872 bytes

On Jul 10 at  1:54, Richard Goerwitz writes:
}
} Why doesn't the following program output "go"?
}
} procedure main()
}   write(writeit())
} end
}
} procedure writeit()
}   (return \stopit)
}   return "go"
} end
}
} It looks, however, as though the expression
}
}   return \stopit
}
} is the same as
}
}   fail
}
} at least in this instance, where \stopit fails.
} Why is this so?  Why doesn't the program simply
} print "go"?
}
One thing to keep in mind is that 'return' is a control regime
and not an operator.  While I can see arguments for the behavior
of 'return' going either way, I prefer it the way it is, as I
more often write things like:

	return f(x)

where I want the current function to fail if f(x) fails.

You might see if the control regime

	suspend \stopit

fits with what you're trying to do...

--
	Steve Wampler
	{....!arizona!naucse!sbw}

Re: return expressions

#44

Author: cheyenne@arizona
Date: Tue, 11 Jul 1989 01:37

16 lines
206 bytes



>You might see if the control regime
>
>        suspend \stopit
>
>fits with what you're trying to do...

Or you might want to try:

procedure writeit()
    return \stopit | "go"
end

Cheyenne Wills

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