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From: cg@myriasa.UUCP (Chris Gray)
Newsgroups: net.lang.c
Subject: if (X) <==> if (X != 0)
Message-ID: <173@myriasa.UUCP>
Date: Fri, 13-Sep-85 12:26:50 EDT
Article-I.D.: myriasa.173
Posted: Fri Sep 13 12:26:50 1985
Date-Received: Sat, 14-Sep-85 17:34:21 EDT
References: <118@mit-hector.UUCP> <2792@sun.uucp>
Organization: Myrias Research, Edmonton
Lines: 22

We're going though the usual arguments about how the type 'boolean'
should be fudged, and I came across this example:

typedef enum {FALSE, TRUE} bool;

f()
{
    bool flag;

    if (flag) {
	printf("Hello\n");
    }
    if (flag != 0) {
	printf("Good-bye\n");
    }
}

The BSD 4.2 C compiler is happy about the first 'if', but warns about
'enumeration type clash' on the second. This at least is one case where
'if (X)' isn't the same as 'if (X != 0)'.

				Chris Gray   {...,ihnp4}!alberta!myrias!cg