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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 visibility
• 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 symbuls
• 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