1 Introduction 2 Environment 3 Language 4 Library 5 Appendices Index Rationale for American National Standard for Information Systems - Programming Language - C (This Rationale is not part of American National Standard X3.159-1989, but is included for information only.) UNIX is a registered trademark of AT&T. DEC and PDP-11 are trademarks of Digital Equipment Corporation. POSIX is a trademark of I
