Xref: utzoo comp.lang.fortran:782 comp.lang.c:10814 Path: utzoo!attcan!uunet!husc6!mailrus!ames!ll-xn!mit-eddie!bloom-beacon!mcgill-vision!mouse From: mouse@mcgill-vision.UUCP (der Mouse) Newsgroups: comp.lang.fortran,comp.lang.c Subject: Re: Should I convert FORTRAN code to C? Message-ID: <1172@mcgill-vision.UUCP> Date: 20 Jun 88 08:34:07 GMT References: <10655@agate.BERKELEY.EDU> <1857@hubcap.UUCP> <10681@agate.BERKELEY.EDU> Organization: McGill University, Montreal Lines: 36 In article <10681@agate.BERKELEY.EDU>, jerry@violet.berkeley.edu ( Jerry Berkman ) writes: > As for "x = abs(x);", it does compile and load. > However, it's calling a library function. What's wrong with that? > (1) It's slow. > (2) It returns the absolute value of integers. You can type it > "float abs();" and it works on the VAX, but it may not work on > all systems. Doesn't work on our VAX. Your VAX must be using a different floating-point format from the one in the VAX architecture manual. I tried compiling and running this: float abs(); main() { printf("%g\n",abs(123.456)); printf("%g\n",abs(-123.456)); } and it gave me -0.00210706 0.00210706 Of course, maybe you think that's what it means for it to work on the VAX....but I daresay most people would disagree. (You could also break down and use fabs, the floating-point absolute value routine - or is that cheating?) der Mouse uucp: mouse@mcgill-vision.uucp arpa: mouse@larry.mcrcim.mcgill.edu