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From: ken@aiai.ed.ac.uk (Ken Johnson)
Newsgroups: misc.misc,comp.misc
Subject: Re: The "evil" GOTO (Was: 25 Years of BASIC)
Message-ID: <415@skye.ed.ac.uk>
Date: 5 May 89 10:10:27 GMT
References: <1791@ubu.warwick.UUCP> <1436@onion.reading.ac.uk> <1814@ubu.warwick.UUCP>
Reply-To: ken@aiai.UUCP (Ken Johnson)
Followup-To: comp.misc
Organization: AIAI, University of Edinburgh, Scotland
Lines: 37


In article <1814@ubu.warwick.UUCP> mirk@uk.ac.warwick.cs (Mike Taylor) writes:
>How many times have you seen this kind of code?
>
>	printf ("Enter your sex: ");
>	while (sex != "m" && sex != "f") {
>		gets (sex);
>		if  (sex != "m" && sex != "f")
>			printf ("<m> or <f> only: ");
>	}
>

I like doing it this way: (NB This is not correct C! But I think it is
a correct program structure for the problem.)


get_sex( )
{
	return(get_sex_sub("Enter your sex: "));
}

get_sex_sub(string)
{
	printf (string);
	gets(sex)
	return(
		(sex == 'm' || sex == 'f')
		?
		sex
		:
		get_sex_sub("<m> or <f> only: ")
	      );
}
-- 
Ken Johnson, AI Applications Institute, 80 South Bridge, Edinburgh EH1 1HN
E-mail ken@aiai.ed.ac.uk, phone 031-225 4464 extension 212
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