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From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: Point me in the right direction
Message-ID: <1043@auspex.UUCP>
Date: 18 Feb 89 09:50:53 GMT
References: <23631@watmath.waterloo.edu> <1841@mit-caf.MIT.EDU> <807@atanasoff.cs.iastate.edu>
Reply-To: guy@auspex.UUCP (Guy Harris)
Organization: Auspex Systems, Santa Clara
Lines: 28


 >>double fund_consts[] = {
 >>	3.14159265,
 >>	2.7182818,
 >>	6.02E23,
 >>};
 >
 >   Of course, adding:
 >
 >     #define N_FCONSTS (sizeof(fund_consts)/sizeof(double)) 

So far, so good - this is an old C trick, which is quite useful, but may
not be known as well as it should be - but...

 >   then you can use stuff like:
 >
 >     extern fund_consts[N_FCONSTS];

(try "extern double fund_consts[...]"; that declaration makes it an
array of "int")

 >   elsewhere.

...only if "fund_consts" is *defined* in the same "elsewhere", or at
least declared with a size other than N_FCONSTS (since the value of the
expression "(sizeof(fund_consts)/sizeof(double))" depends on the size
declared for "fund_consts"), which seems unlikely - if it's defined
there, why declare it all over again later in the same module?