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Comment by bregma

5 days ago

FORTRAN had both functions and subroutines. A function returned a value and was invoked in an expression (eg. S=SIN(A)). A subroutine was invoked by calling it (eg. CALL FOPEN(FNAME, PERMS)).

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bregma

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kragen  5 days ago

I should probably just Google this, but how did you define the functions?

  • bregma  5 days ago 

        C     -------- START OF FUNCTION -------    
          INTEGER FUNCTION INCREMENT(I)
          INCREMENT=I+1
          RETURN
          END
    C     -------- END OF FUNCTION -------

    • kps  5 days ago

      FORTRAN also had single-expression function definitions, e.g.

          ARGF(X, Y, Z) = (D/E) * Z+ X** F+ Y/G

      Naturally this is syntactically identical to an array element assignment, which is one of the many things that made compiling FORTRAN so much fun.

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