[TUHS] origin of C header files

Nigel Williams nw at retrocomputingtasmania.com
Fri Dec 29 20:58:28 AEST 2017

On Fri, Dec 29, 2017 at 7:26 PM, Wesley Parish <wobblygong at gmail.com> wrote:
> Which raised the question: when did header files come into use? Who
> was the first to use header files to store common system-wide or
> application-wide data definitions? Was it used in any languages prior
> to C?

COBOL 60 (April 1960) had INCLUDE (page V-27):


FUNCTION: To save the programmer effort by automatically incorporating
          library subroutines into the source program.

It even had a literal substitution mechanism to rewrite the included text.

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