Statement computer science Wikipedia. In computer programming, a statement is the smallest standalone element of an imperativeprogramming language that expresses some action to be carried out. It is an instruction written in a high level language that commands the computer to perform a specified action. A program written in such a language is formed by a sequence of one or more statements. A statement may have internal components e. What Is Object In Java With Example Program on this page. Many languages e. C make a distinction between statements and definitions, with a statement only containing executable code and a definition instantiating an identifier, while an expression evaluates to a value only. About this Video. Topics covered Tuples, lists, dictionaries, methods, identifiers, modifying objects, aliasing, mutability. Resources. Lecture code handout PDF. Define computer. computer synonyms, computer pronunciation, computer translation, English dictionary definition of computer. A device that computes. A distinction can also be made between simple and compound statements the latter may contain statements as components. Kinds of statementseditThe following are some of the major generic kinds of statements, pseudocoded. These pseudocoded statements have an immediate corresponding syntax in any typical imperative language like Pascal, C, Fortran etc. Simple statementseditassertionin C assertptr  NULL assignmentin Pascal A A 5in C and Fortran A A 5gotoreturnin C, Pascal and Fortran return value callin C and Pascal CLEARSCREENin Fortran call CLEARSCREENCompound statementseditblock. Pascal begin. endin C. A  1 to 1. 0 do WRITELNA endif statement if A 3 then WRITELNA else WRITELNNOT YET endswitch statement switch c case a alert break case q quit break while loop while NOT EOF do begin READLN endwith statement with openfilename as f usefThe appearance of statements shapes the look of programs. Programming languages are characterized by the type of statements they use e. Many statements are introduced by identifiers like if, while or repeat. Often statement keywords are reserved such that they cannot be used as names of variables or functions. Imperative languages typically use special syntax for each statement, which looks quite different from function calls. Common methods to describe the syntax of statements are BackusNaur form and syntax diagrams. SemanticseditSemantically many statements differ from subroutine calls by their handling of parameters. Usually an actual subroutine parameter is evaluated once before the subroutine is called. Kubota L3240 Service Manual on this page. This contrasts to many statement parameters that can be evaluated several times e. Technically such statement parameters are call by name parameters. Call by name parameters are evaluated when needed see also lazy evaluation. When call by name parameters are available a statement like behaviour can be implemented with subroutines see Lisp. For languages without call by name parameters the semantic description of a loop or conditional is usually beyond the capabilities of the language. Therefore, standard documents often refer to semantic descriptions in natural language. ExpressionseditIn most languages, statements contrast with expressions in that statements do not return results and are executed solely for their side effects, while expressions always return a result and often do not have side effects at all. Among imperative programming languages, Algol 6. In languages that mix imperative and functional styles, such as the Lisp family, the distinction between expressions and statements is not made even expressions executed in sequential contexts solely for their side effects and whose return values are not used are considered expressions. Vice City Game Editor here. In purely functional programming, there are no statements everything is an expression. This distinction is frequently observed in wording a statement is executed, while an expression is evaluated. This is found in the exec and eval functions found in some languages in Python both are found, with exec applied to statements and eval applied to expressions. ExtensibilityeditMost languages have a fixed set of statements defined by the language, but there have been experiments with extensible languages that allow the programmer to define new statements. See alsoeditReferenceseditExternal linksedit.