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<H3><A NAME="SECTION000151200000000000000">
Data Types</A>
</H3>
<P>
There is a simple correspondence between Sun FORTRAN and C numeric variable
types.
The standard types are given in the upper part of
the table below,
and
non-standard extensions in the lower part. These should generally be avoided
for reasons of portability, however, they are provided since
<A HREF="/star/docs/sun92.htx/sun92.html#xref_">HDS</A>
has corresponding data types.
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="2117"></A>
<TABLE>
<CAPTION><STRONG>Table:</STRONG>
Corresponding data types for Sun Solaris</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
<TR><TD ALIGN="CENTER" COLSPAN=1><I>type</I></TD>
<TD ALIGN="CENTER" COLSPAN=1>Sun FORTRAN</TD>
<TD ALIGN="CENTER" COLSPAN=1>Sun C</TD>
</TR>
<TR><TD ALIGN="LEFT">INTEGER</TD>
<TD ALIGN="LEFT">INTEGER</TD>
<TD ALIGN="LEFT">int</TD>
</TR>
<TR><TD ALIGN="LEFT">REAL</TD>
<TD ALIGN="LEFT">REAL</TD>
<TD ALIGN="LEFT">float</TD>
</TR>
<TR><TD ALIGN="LEFT">DOUBLE</TD>
<TD ALIGN="LEFT">DOUBLE PRECISION</TD>
<TD ALIGN="LEFT">double</TD>
</TR>
<TR><TD ALIGN="LEFT">LOGICAL</TD>
<TD ALIGN="LEFT">LOGICAL</TD>
<TD ALIGN="LEFT">int</TD>
</TR>
<TR><TD ALIGN="LEFT"> </TD>
<TD ALIGN="LEFT">CHARACTER*1</TD>
<TD ALIGN="LEFT">char</TD>
</TR>
<TR><TD ALIGN="LEFT">CHARACTER</TD>
<TD ALIGN="LEFT">CHARACTER*n</TD>
<TD ALIGN="LEFT">char[n]</TD>
</TR>
<TR><TD ALIGN="LEFT">BYTE</TD>
<TD ALIGN="LEFT">BYTE</TD>
<TD ALIGN="LEFT">signed char</TD>
</TR>
<TR><TD ALIGN="LEFT">WORD</TD>
<TD ALIGN="LEFT">INTEGER*2</TD>
<TD ALIGN="LEFT">short int</TD>
</TR>
<TR><TD ALIGN="LEFT">UBYTE</TD>
<TD ALIGN="LEFT"> </TD>
<TD ALIGN="LEFT">unsigned char</TD>
</TR>
<TR><TD ALIGN="LEFT">UWORD</TD>
<TD ALIGN="LEFT"> </TD>
<TD ALIGN="LEFT">unsigned short int</TD>
</TR>
<TR><TD ALIGN="LEFT">POINTER</TD>
<TD ALIGN="LEFT">INTEGER</TD>
<TD ALIGN="LEFT">unsigned int</TD>
</TR>
</TABLE>
</DIV>
<A NAME="sun_datatypes"></A></TD></TR>
</TABLE>
</DIV>
<BR>
<P>
Although C defines unsigned data types of <TT>unsigned char</TT>
(range 0 to 255), <TT>unsigned short</TT> (range 0 to 32767) and
<TT>unsigned int</TT> (range 0 to 2<SUP>32</SUP>-1), there are no corresponding
unsigned data types in FORTRAN.
There is also a C type called <TT>long int</TT>, however on Suns, this is the
same as an <TT>int</TT>.
<P>
The C language does not specify whether variables of type <TT>char</TT> should
be stored as signed or unsigned values. On Suns, they are stored as signed
values in the range -128 to 127.
<P>
Similarly there is no C data type that corresponds to the FORTRAN data type of
<TT>COMPLEX</TT>. However, since Sun FORTRAN passes all numeric variable by
reference, a <TT>COMPLEX</TT> variable could be passed to a C subprogram where
it might be handled as a structure consisting of two variables of type
<TT>float</TT>.
<P>
A Sun FORTRAN <TT>LOGICAL</TT> value can be passed to a C <TT>int</TT>.
Sun FORTRAN and C both use zero to represent a false value and anything else
to represent a true value, so there is no problem with converting the data
values.
<P>
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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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