Xref: utzoo misc.jobs.offered:2535 comp.lang.c:19608
Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!bloom-beacon!mcgill-vision!mouse
From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: misc.jobs.offered,comp.lang.c
Subject: Re: 1000 lines of C a week?
Message-ID: <1570@mcgill-vision.UUCP>
Date: 27 Jun 89 09:53:54 GMT
References: <15526@pollux.UUCP> <18783@vax5.CIT.CORNELL.EDU> <19436@cup.portal.com>
Distribution: na
Organization: McGill University, Montreal
Lines: 38

In article <19436@cup.portal.com>, Tim_CDC_Roberts@cup.portal.com writes:
> In <18783@vax5.CIT.CORNELL.EDU>, sc2y@vax5.cit.cornell.edu asks with
>   tongue in cheek:
>>> A project needs a person with a proven capability of generating a
>>> thousand lines of debugged C a week.

>> Okay, how about this?
>>   /* compute square root of a number if less than 1000 */
>>   float comp_sqrt(x) int x; {
>>    if (x  == 1)
>>      return (sqrt(x));
>>     ....

> Since you didn't declare "double sqrt (double)",

If we're being picky, he also didn't say the code he exhibited was the
entire file: it could have been just one routine extracted from a file
which quite possibly had a line "#include <math.h>" above the sample.

> and you are passing an int to a function expecting a double, and
> returning a double for a function that is supposed to return a float,
> this function will fail on any machine where sizeof(int) !=
> sizeof(double) or sizeof(float) != sizeof(double).

Actually (under the assumptions you made, ie, no declarations), it
requires more than just that int and double have the same size - it
also requires that for all values 1 to 999, the bit patterns are
identical and are passed to sqrt() in the same way.  (I expect this
excludes all existing C compilers.  I certainly *hope* it does!)

The "returning a double when supposed to return a float" is specious:
return values have always been cast to the proper type for the
function, even in Classic C.

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu