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<H1><A NAME="SECTION00040000000000000000"></A><A NAME="xref_representation_of_data"></A>
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Representation of Data
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<P>
Different languages have differing fundamental data types on which they can
operate. FORTRAN has the types <TT>INTEGER</TT>, <TT>REAL</TT>,
<TT>DOUBLE PRECISION</TT>, <TT>COMPLEX</TT>, <TT>LOGICAL</TT> and
<TT>CHARACTER</TT>. The only aggregate data type that it supports is the
array, although a character variable can store many characters. C supports the
fundamental types <TT>int</TT>, <TT>float</TT>, <TT>double</TT>, <TT>char</TT>,
and <TT>void</TT>. It also allows <TT>int</TT> to be modified by the type
specifiers <TT>short</TT> or <TT>long</TT>, <TT>signed</TT> or
<TT>unsigned</TT>, <TT>char</TT> to be modified
by <TT>signed</TT> or <TT>unsigned</TT> and <TT>double</TT> to be modified by
<TT>long</TT>. However, on any given machine, some of the <TT>short</TT>,
normal and <TT>long</TT> types may be represented in the same way.
C also provides a range of pointer types which may, for purposes of
interchange with FORTRAN, all be condensed into the generic pointer
type <TT>void*</TT>.
Note that, unlike FORTRAN, a C character variable can only store a single
character.
Also unlike FORTRAN, a C
character variable is treated as a type of integer rather than as a separate
type. Finally, ANSI C has the type <TT>enum</TT>, an enumerated list of values.
The aggregate data types are the array, structure and union. New types can be
defined in terms of the basic types by means of a <TT>typedef</TT> statement.
<P>
When writing mixed language programs, it is clearly important to know which
FORTRAN types map on to which C types; in particular, which similar types use
the same amount of storage. This is discussed more fully in
<A HREF="node45.html#implement">the machine dependent sections</A>
; however, there are some general
points to be considered first.
<P>
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<LI><A NAME="tex2html273"
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HREF="node10.html">Logical Types</A>
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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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