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This chapter will deal with the following topics.

 1. The data representation of the basic types supported by Watcom C/C++.

 2. The memory layout of a Watcom C/C++ program.

 3. The method for passing arguments and returning values.

 4. The two methods for passing floating-point arguments and returning
    floating-point values.

    One method is used when one of the Watcom C/C++ "fpi" or "fpi87" options
    is specified for the generation of in-line 80x87 instructions.  When the
    "fpi" option is specified, an 80x87 emulator is included from a math
    library if the application includes floating-point operations.  When the
    "fpi87" option is used exclusively, the 80x87 emulator will not be
    included.

    The other method is used when the Watcom C/C++ "fpc" option is
    specified.  In this case, the compiler generates calls to floating-point
    support routines in the alternate math libraries.

An understanding of the Intel 80x86 architecture is assumed.