xerox Mesa Language Manual Version 4.0 May78 free download

File name Mesa_Language_Manual_Version_4.0_May78.pdf

Mesa Language Manual by James G. Mitchell William Maybury Richard Sweet Version 4.0 May 1978 Mesa is the language component of a programming system intended for developing and maintaining a wide range of systems and applications programs. It includes facilities for user-defined data types, strong compile-time type checking of both data types and program interfaces, procedure and coroutine control mechanisms, control structures for dealing with concurrency and exceptional conditions, and features designed to support the development of systems composed of separate modules and to control information sharing among them. XEROX PALO ALTO RESEARCH CENTER 3333 Coyote Hill Road / Palo Alto / California 94304 SYSTEMS DEVELOPMENT DEPARTMENT 3408 Hillview Avenue / Palo Alto / California 94304 This document is for internal Xerox use only. CONTENTS CHAPTER 1. INTRODUCTION 1 1.1. Syntax notation 2 CHAPTER 2. BASIC DATA TYPES AND EXPRESSIONS 4 2.1. A slice of Mesa code 4 2.1.1. Basic lexical structure 5 2.2. Simple declarations 6 2.3. The fundamental operations, ... , =, and # 7 2.4. Basic types 7 2.4.1. T.he numeric types INTE.GER, LONG INTEGER and CARDINAL 7 2.4.1.1. Numeric literals 8 2.4.2. Type REAL 9 2.4.3. Type BOOLEAN 9 2.4.4. Type CHARACTER 10 2.4.5. Relations among basic types 10 2.5. Expressions 11 2.5.1. Numeric operators 12 2.5.1.1. The operator LONG 14 2.5.1.2. CHARACTER operators 15 2.5.2. Relational operators 15 2.5.3. BOOLEAN operators 16 2.5.4. Assignment expressions 17 2.6. Initializing variables in declarations 17 2.6.1. Compile-time constants 18 2.7. More general declarations