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<TITLE>TRAIL_ARG
- Pass the length of a CHARACTER argument to a FORTRAN routine
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<H2><A NAME="SECTION0001969000000000000000"></A><A NAME="xref_TRAIL_ARG"></A><A NAME="TRAIL_ARG"></A>
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TRAIL_ARG
- Pass the length of a CHARACTER argument to a FORTRAN routine
</H2>
<DL>
<DT><STRONG>Description:</STRONG>
<DD><DL>
<DD>Pass the length of a CHARACTER argument or a CHARACTER array argument
element length to a FORTRAN routine if the FORTRAN routine expects to
receive it as a separate argument. The corresponding integer variable is
handled automatically where it is needed.
</DL>
<BR>
<DT><STRONG>Invocation:</STRONG>
<DD><DL>
<DD><TT> TRAIL_ARG(arg)
</TT>
</DL>
<BR>
<DT><STRONG>Arguments:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG>
arg
</STRONG>
<DD>
The name of the CHARACTER or CHARACTER array actual argument being
passed.
</DL>
<BR>
<DT><STRONG>Examples:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG><TT> TRAIL_ARG(arg)
</TT></STRONG>
<DD>will expand as follows:
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">All Unix:</TD>
<TD ALIGN="LEFT"><TT> ,arg_length</TT></TD>
</TR>
<TR><TD ALIGN="LEFT">VAX/VMS:</TD>
<TD></TD>
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<ADDRESS>
<I>CNF and F77 Mixed Language Programming -- FORTRAN and C<BR>Starlink User Note 209<BR>P.M. Allan<BR>A.J. Chipperfield<BR>R.F. Warren-Smith<BR>19 January 2000<BR>E-mail:<A HREF="mailto:ussc@star.rl.ac.uk">ussc@star.rl.ac.uk</A></I>
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