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The C library provides much of the power usually associated with the C
language.  This chapter introduces the individual functions (and macros)
that comprise the Watcom C library.  The chapter Library Functions and
Macros describes each function and macro in complete detail.

Library functions are called as if they had been defined within the program.
 When the program is linked, the code for these routines is incorporated
into the program by the linker.

Strictly speaking, it is not necessary to declare most library functions
since they return int values for the most part.  It is preferred, however,
to declare all functions by including the header files found in the synopsis
section with each function.  Not only does this declare the return value,
but also the type expected for each of the arguments as well as the number
of arguments.  This enables the Watcom C and C++ compilers to check the
arguments coded with each function call.