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- Is this the FORTRAN logical value true?
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<H2><A NAME="SECTION0001953000000000000000"></A><A NAME="xref_F77_ISTRUE"></A><A NAME="F77_ISTRUE"></A>
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F77_ISTRUE
- Is this the FORTRAN logical value true?
</H2>
<DL>
<DT><STRONG>Description:</STRONG>
<DD><DL>
<DD>Does the argument of the macro evaluate to a value that FORTRAN
would treat as a LOGICAL true?
</DL>
<BR>
<DT><STRONG>Invocation:</STRONG>
<DD><DL>
<DD><TT> if( F77_ISTRUE(var) ) ...
</TT>
</DL>
<BR>
<DT><STRONG>Arguments:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG>
var
</STRONG>
<DD>
The name of the value to be tested.
</DL>
<BR>
<DT><STRONG>Examples:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG><TT> F77_ISTRUE(var)
</TT></STRONG>
<DD>will expand as follows:
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">Solaris:</TD>
<TD ALIGN="LEFT"><TT> ( var )</TT></TD>
</TR>
<TR><TD ALIGN="LEFT">OSF/1:</TD>
<TD ALIGN="LEFT"><TT> ( (var)&1 )</TT></TD>
</TR>
<TR><TD ALIGN="LEFT">VAX/VMS:</TD>
<TD ALIGN="LEFT"><TT> ( (var)&1 )</TT></TD>
</TR>
</TABLE></DL>
<BR>
<DT><STRONG>Notes:</STRONG>
<DD><UL><LI>The VAX FORTRAN and DEC FORTRAN for RISC compilers only use the
lowest bit for the logical flag.
Hence 0 = false, 1 = true, 2 = false, 3 = true, etc.
<P>
<LI>The Sun FORTRAN compiler uses zero = false, non zero = true.
<P>
<LI>The FORTRAN for RISC compiler (from MIPS) on the DECstation
uses zero = false, non zero = true. This means that the correct
value of this C macro depends on which FORTRAN compiler is
being used.
</UL>
<BR>
</DL>
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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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