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When examining some legacy Fortran code, I’ve found a subroutine declaration that is the following:
SUBROUTINE CLIP2G (fcut,TIME,NUMS,NUMG,CLIPG,CLIPGL,CLIPGR,
* MODE,PHZ)
What does the * signify in this context? Does the star * mean that the subroutine declaration spans two lines rather than one line?
This is a line continuation mark in fixed form Fortran. It marks that this line is a continuation of the previous one. It may be any Fortran recognized character that is not a blank (space
0), but it must be placed in column 6. If character position 6 contains a blank or zero, the line is the initial line of a new statement, which begins in character position 7. (F2018 6.3.3.3)A more thorough discussion of line continuations in fixed and free Fortran form, including the "intersection form" that can be included in files of either form, is at Fortran Wiki:
Continuation lines.