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Difference between Syntax and Semantics
2022-10-28 00:36:37

Difference between Syntax and Semantics

The phrases syntax and semantics are crucial in relation to every computer language. The syntax of a computer language refers to the list of phrases that are allowed in that language, whereas semantics specifies the meanings that those words have.

What is Syntax?

Programming language’s syntax is used to represent the structure of programs without taking their meaning into account. In essence, it draws attention to a program's structure and arrangement through aesthetics. It involves a set of guidelines that verify the order in which symbols and instructions are utilised in a program. These syntactic elements of a programming language are figured by the computational and pragmatic model.

What purpose does grammar serve in this situation, though? Grammars are rewriting rules used to identify and produce programs. Grammar describes the structure of the language rather than relying on the computing paradigm. The grammar includes solitary words (alphabet elements), a finite collection of grammatical categories (such as noun phrase, verb phrase, article, noun, etc.), and well-formed rules to describe the order in which the grammatical category components should appear.

Compilers use syntax analysis to determine whether a program has a correctly related derivation tree or not.

These formal and informal methods can be used to interpret the syntax of a programming language:

  • The rules for fundamental symbols, including identifiers, literals, punctuation, and operators, are defined by lexical syntax.
  • With the use of lexical symbols, such as its alphabet, concrete syntax specifies the actual representation of programs.
  • Only the essential program information is communicated using abstract syntax.

Several grammars

  • It is frequently used to determine the entire language structure using context-free grammar.
  • Regular expressions describe the lexical constructions (tokens) of a computer language.
  • The context-sensitive portion of the language is described by attribute grammars.

What is Semantics?

A programming language's semantics concept is used to determine how the syntax and computation model relate to one another. It places a focus on the interpretation of a program so that the programmer can easily grasp it or forecast how the program will behave when it is executed. Syntactical constructs are mapped with the aid of a function to the computational model using a technique known as syntax-directed semantics.

Algebraic semantics, Axiomatic semantics, Operational semantics, Denotational semantics, and Translation semantics are some of the methodologies that can be used to define the semantics of computer languages.

  • By defining algebra, algebraic semantics interprets the program.
  • Axiomatic semantics establishes the meaning of a program by creating statements about an association that detain at each stage of the program's execution.
  • Operational semantics evaluates the program as a series of state changes after comparing the languages to the abstract machine.
  • The meaning of the program is expressed by a collection of functions that operate on the state of the program in denotation semantics.
  • A program's translation into another language is the subject of translational semantics.

Key Differences between Semantics and Syntax

  • The structure of a program written in a programming language is referred to as syntax. Semantics, on the other hand, explains the connection between the computational model and the program's sense.
  • Syntactic mistakes are dealt with during compilation. Contrarily, semantic errors are hard to spot and occur during runtime.
  • For instance, a variable named "s" is declared in the C++ language as "int s;" so we must initialise it with an integer value. We began it with "Seven" instead of an integer. Because "Seven" does not represent integer form, this declaration and initialization are syntactically correct but conceptually erroneous.

Difference between Semantic and Syntax in Tabular Form

BasisSyntaxSemantics
MeaningIt specifies to the syntax of any programming language statement.The meaning attached to any statement in the programming language is referred to.
ErrorIt is known as a syntax error. Typically, it appears during compilation. When a statement is made that violates the grammar of the programming language, it happens. Examples include the use of undeclared variables in Java and the absence of semicolons in C++.Semantic mistake was mentioned. Typically, it appears during runtime. When a statement is syntactically correct but does not perform as intended by the programmer, something happens. It's challenging to spot this kind of mistake.
SensitivityIn most programming languages, syntax is delicate.Case is generally not a factor in semantics.