3 ms·

Table 8-3, page 8-7 (pdf page 97): http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-AFDO-D%20decsystem10%20FORTRAN%20IV%20Programmer's%20Refer

• raphlinus 5y ago
  1965: https://www.ecma-international.org/publications-and-standards/standards/ecma-9/ https://www.ecma-international.org/publications-and-standard... pdf page 36
  • floxy 5y ago
    Nice find. Anyone have a way to search for old versions "math.h"? The 1989 version of ANSI C had atan2: https://web.archive.org/web/20161223125339/http://flash-gordon.me.uk/ansi.c.txt https://web.archive.org/web/20161223125339/http://flash-gord... ...but I wonder when it first hit the scene.
    • kimixa 5y ago
      According to https://unix.superglobalmegacorp.com/ https://unix.superglobalmegacorp.com/ it was in 3bsd libm -https://unix.superglobalmegacorp.com/cgi-bin/cvsweb.cgi/3BSD/lib/libm/atan.c?rev=1.1.1.1;content-type=text%2Fplain;only_with_tag=MAIN https://unix.superglobalmegacorp.com/cgi-bin/cvsweb.cgi/3BSD... 3BSD was released at the end of 1979 according to wikipedia, and that's just the oldest BSD source I could find, so it may have been in even older versions. Before ANSI/ISO C I don't think there was really a "math.h" to look for - as it may be different on different systems, but as so many things derive from BSD I wouldn't be surprised if it was "de-facto" standardised to what that supported.