Many important features of the C language are implementation-dependent since the ISO/ANSI Standard language definition does not completely specify all aspects of the language. This flexibility in the finer details permits C to be implemented on a variety of machine architectures without forcing code generation sequences that are elegant on one machine and awkward on another. This chapter focuses on hardware and operating-system-dependent features of the compiler as implemented on machines with IBM 370 architecture that are running under one of the OS/390 or CMS operating systems or any extended architecture system.
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