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XPL Reference Manual

XPL is an imperative language and is intuitively presented in this manual. The language's basic characteristics are presented, such as data types, names manipulation, lexical conventions, structure/syntax, function specification, instruction semantics, expression semantics, and, finally, a few examples.

Table of Contents

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• 1 Data Types
• 2 Names Manipulation
• 2.1 Namespace and identifier scope
• 2.2 Variable validity
• 3 Lexical Convetions
• 3.1 Blank characters
• 3.2 Comments
• 3.3 Keywords
• 3.4 Types
• 3.5 Expression operators
• 3.6 Delimiters and terminators
• 3.7 Identifiers (names)
• 3.8 Literals
• 3.8.1 Integers
• 3.8.2 Floating point reals
• 3.8.3 Strings
• 3.8.4 Pointers
• 4 Syntax
• 4.1 Types, identifiers, literals, and expression definitions
• 4.2 Left-values
• 4.3 Files
• 4.4 Variable declarations
• 4.5 Global symbols
• 4.6 Initialization
• 5 Functions
• 5.1 Declaração
• 5.2 Invocation
• 5.3 Body
• 5.4 Main function and program execution
• 6 Statements
• 6.1 Blocks
• 6.2 Conditional statement
• 6.3 Iteration statement: while
• 6.4 Iteration statement: sweep
• 6.5 Termination statement: stop
• 6.6 Continuation statement: next
• 6.7 Return statement: return
• 6.8 Expressions as statements and printing operations
• 7 Expressions
• 7.1 Primitive expressions
• 7.1.1 Identifiers
• 7.1.2 Reading
• 7.1.3 Parenthesis
• 7.2 Expressions as a result of operator evaluation
• 7.2.1 Indexing
• 7.2.2 Identity and symmetry
• 7.2.3 Memory allocation
• 7.2.4 Address of expression
• 8 Examples