Programming Language Syntax and Semantics

<p>It ensures a certain condition remains true at the start of each iteration.</p> Signup and view all the answers

<p>They determine the structure and syntax of arithmetic expressions.</p> Signup and view all the answers

<p>It represents the meaning or behavior of code.</p> Signup and view all the answers

<p>It analyzes the code for correct syntax.</p> Signup and view all the answers

<p>It can be parsed in multiple ways leading to different meanings.</p> Signup and view all the answers

<p>To include optional elements in the grammar.</p> Signup and view all the answers

<p>It ensures variable declarations are followed before use.</p> Signup and view all the answers

<p>A definition of how specific constructs are formed.</p> Signup and view all the answers

<p>The smallest unit of meaningful code.</p> Signup and view all the answers

<p>To describe complex structures by referencing themselves.</p> Signup and view all the answers

<p>Denotational semantics uses mathematical functions to map expressions to values, while operational semantics describes how program execution changes state in memory step-by-step.</p> Signup and view all the answers

<p>Preconditions specify conditions that must be true before a statement is executed, and postconditions describe expected outcomes after the execution, ensuring correctness.</p> Signup and view all the answers

<p>A loop invariant is a condition that remains true at the start of each iteration of a loop, helping to prove the correctness of the loop's behavior and termination.</p> Signup and view all the answers

<p>Attribute grammars can assign and propagate semantic information, such as type checks, allowing for more sophisticated analysis like ensuring type compatibility in expressions.</p> Signup and view all the answers

<p>BNF provides a formal way to describe the syntax of programming languages by specifying rules for constructing valid sentences or expressions.</p> Signup and view all the answers

<p>The initialization occurs once before the loop begins, while the increment happens at the end of each iteration, allowing the loop to execute repeatedly as long as the condition remains true.</p> Signup and view all the answers

<p>A lexeme is the actual string of characters that represent a syntactical unit, while a token is the category of that lexeme, like identifier or operator.</p> Signup and view all the answers

<p>The parser reads the source code and checks if it adheres to the language's grammar, ensuring syntactical correctness.</p> Signup and view all the answers

<p>Recursion enables the formation of lists by allowing the same rule to call itself, thereby constructing lists of varying lengths.</p> Signup and view all the answers

<p>Ambiguous grammar can result in expressions being parsed in different ways, leading to confusion in how the code is executed.</p> Signup and view all the answers

<p>Declaring a variable before use ensures that the variable is defined, preventing runtime errors and promoting code clarity.</p> Signup and view all the answers

<p>It resolves ambiguity by clearly defining how expressions should be evaluated, thus preventing multiple interpretations.</p> Signup and view all the answers

<p>EBNF allows for the inclusion of optional elements and repetition in grammar descriptions, making it more expressive than standard BNF.</p> Signup and view all the answers