On Tue, 20 Nov 2018 02:05:42 +0000, David Spiegel wrote: >CDC ... Txed? > Don't remember.
>(i did CDC way back in '80. I had a lot of fun with their unusual JCL >and Negative Zeroes.) > IBM 70[49]* had negative zeroes. Both IBM and CDC FORTRANs read in a blank field as "-0". There was significant angst among programmers on discovering there was no way to recognize a blank field used to represent missing data. Some theorems in computational numerical analysis depend on the range of numbers' being symmetrical. True for ones-complement and sign-magnitude, but not for twos-complement. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
