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The Watcom Debugger is capable of handling a wide variety of expressions.
 An expression is a combination of operators and operands selected from
application variables and names, debugger variables, and constants.
 Expressions can be used in a large number of debugger commands and dialogs.
 For example, the evaluated result of an expression may be displayed by
choosing New from the pop-up menu in the Watches window or by using the
print command.

The appropriate syntax of an expression, i.e., the valid sequence of
operators and operands, depends on the grammar of the language that is
currently established.  The Watcom Debugger supports the grammars of the C,
C++, and FORTRAN 77 languages.  A grammar is selected automatically by the
debugger when tracing the execution of modules in an application.  For
example, part of an application may be written in C, another part in C++,
and another part in FORTRAN 77.  The modules must have been compiled by one
of the WATCOM C, C++ or FORTRAN 77 compilers.  When tracing into a module
written in one of these languages, the debugger will automatically select
the appropriate grammar.  In addition to this automatic selection, a
particular grammar may be selected using the debugger Set LAnguage command.
The language currently selected can be determined using the SHow Set
LAnguage command.