Analysis of information sources in references of the Wikipedia article "块 (编程)" in Chinese language version.
Strings of one or more statements may be combined into a single (compound) statement by enclosing them within the "statement parentheses"beginandend. Single statements are separated by the statement separator ";".
Sequences of statements may be combined into compound statements by insertion of statement brackets. ……
Each declaration is attached to and valid for one compound statement. A compound statement which includes declarations is called a block.
The program is divided into a heading and a body, called a block. The heading gives the program a name and lists its parameters. …… The block consists of six sections, where any except the last may be empty. They must appear in the order given in the definition for a block:Block =
LabeLDeclarationPart
ConstantDefinitionPart
TypeDefinitionPart
VariableDeclarationPart
ProcedureAndFunctionDeclarationPart
StatementPart.
……
Each procedure and function declaration has a structure similar to a program; i.e. , each consists of a heading and a block. ……
The compound statement is that of Algol, and corresponds to the DO group in PL/I. ……
The "block structure" differs from that of Algol and PL/I insofar as there are no anonymous blocks; i.e., each block is given a name and thereby is made into a procedure or function.
The compound statement specifies that its component statements be executed in the same sequence as they are written. The symbolsbeginandendact as statement brackets. ……
Pascal uses the semicolon to separate statements, not to terminate statements; i.e., the semicolon is not part of the statement.
LETis used to bind some variables to some objects, and then to evaluate some forms (those which make up the body) in the context of those bindings. ……LET*Same asLETbut does bindings in sequence instead of in parallel.
A sequence of statements may be enclosed between the statement bracketsbeginandendto form a compound statement. ……
A sequence of declarations followed by a sequence of statements and enclosed betweenbeginandendconstitutes a block. Every declaration appears in a block in this way and is valid only for that block.
Since labels are inherently local, no go to statement can lead from outside into a block. A go to statement may, however, lead from outside into a compound statement.
In C, the semicolon is a statement terminator, rather than a separator as it is in languages like Pascal.
Braces{and}are used to group declarations and statements together into a compound statement, or block, so that they are syntactically equivalent to a single statement. The braces that surround the statements of a function are one obvious example; braces around multiple statements after anif,else,while, orforare another. (Variables can be declared inside any block; ……) There is no semicolon after the right brace that ends a block. ……
A label has the same form as a variable name, and is followed by a colon. It can be attached to any statement in the same function as thegoto. The scope of a label is the entire function. ……
C is not a block-structured language in the sense of Pascal or similar languages, because functions may not be defined within other functions. On the other hand, variables can be defined in a block-structured fashion within a function. Declarations of variables (including initializations) may follow the left brace that introduces any compound statement, not just the one that begins a function. Variables declared in this way hide any identically named variables in outer blocks, and remain in existence until the matching right brace. ……
An automatic variable declared and initialized in a block is initialized each time the block is entered.
Automatic variables, including formal parameters, also hide external variables and functions of the same name.
Strings of one or more statements may be combined into a single (compound) statement by enclosing them within the "statement parentheses"beginandend. Single statements are separated by the statement separator ";".
Sequences of statements may be combined into compound statements by insertion of statement brackets. ……
Each declaration is attached to and valid for one compound statement. A compound statement which includes declarations is called a block.
The LISP 1.5 program feature allows the user to write an Algol-like program containing LISP statements to be executed. ……
The program form has the structure - (PROG, list of program variables, sequence of statements and atomic symbols...) An atomic symbol in the list is the location marker for the statement that follows.
Strings of one or more statements may be combined into a single (compound) statement by enclosing them within the "statement parentheses"beginandend. Single statements are separated by the statement separator ";".
Sequences of statements may be combined into compound statements by insertion of statement brackets. ……
Each declaration is attached to and valid for one compound statement. A compound statement which includes declarations is called a block.
A sequence of statements may be enclosed between the statement bracketsbeginandendto form a compound statement. ……
A sequence of declarations followed by a sequence of statements and enclosed betweenbeginandendconstitutes a block. Every declaration appears in a block in this way and is valid only for that block.
Since labels are inherently local, no go to statement can lead from outside into a block. A go to statement may, however, lead from outside into a compound statement.
The ALGOL 60 concepts of block, compound statement and parenthesized expression are unified in ALGOL 68 into the serial-clause. A serial-clause may be an expression and yield a value. ……
A serial-clause consists of a possibly empty sequence of unlabelled phrases, the last of which, if any, is a declaration, followed by a sequence of possibly labelled units. The phrases and the units are separated by go-on-tokens, viz., semicolons. Some of the units may instead be separated by completers, viz.,EXITs; after a completer, the next unit must be labelled so that it can be reached. The value of the final unit, or of a unit preceding anEXIT, determines the value of the serial-clause.
The program is divided into a heading and a body, called a block. The heading gives the program a name and lists its parameters. …… The block consists of six sections, where any except the last may be empty. They must appear in the order given in the definition for a block:Block =
LabeLDeclarationPart
ConstantDefinitionPart
TypeDefinitionPart
VariableDeclarationPart
ProcedureAndFunctionDeclarationPart
StatementPart.
……
Each procedure and function declaration has a structure similar to a program; i.e. , each consists of a heading and a block. ……
The compound statement is that of Algol, and corresponds to the DO group in PL/I. ……
The "block structure" differs from that of Algol and PL/I insofar as there are no anonymous blocks; i.e., each block is given a name and thereby is made into a procedure or function.
The compound statement specifies that its component statements be executed in the same sequence as they are written. The symbolsbeginandendact as statement brackets. ……
Pascal uses the semicolon to separate statements, not to terminate statements; i.e., the semicolon is not part of the statement.
The LISP 1.5 program feature allows the user to write an Algol-like program containing LISP statements to be executed. ……
The program form has the structure - (PROG, list of program variables, sequence of statements and atomic symbols...) An atomic symbol in the list is the location marker for the statement that follows.
LETis used to bind some variables to some objects, and then to evaluate some forms (those which make up the body) in the context of those bindings. ……LET*Same asLETbut does bindings in sequence instead of in parallel.
LETis used to bind some variables to some objects, and then to evaluate some forms (those which make up the body) in the context of those bindings. ……LET*Same asLETbut does bindings in sequence instead of in parallel.
Sequences of statements may be combined into compound statements by insertion of statement brackets. ……
Each declaration is attached to and valid for one compound statement. A compound statement which includes declarations is called a block.
The ALGOL 60 concepts of block, compound statement and parenthesized expression are unified in ALGOL 68 into the serial-clause. A serial-clause may be an expression and yield a value. ……
A serial-clause consists of a possibly empty sequence of unlabelled phrases, the last of which, if any, is a declaration, followed by a sequence of possibly labelled units. The phrases and the units are separated by go-on-tokens, viz., semicolons. Some of the units may instead be separated by completers, viz.,EXITs; after a completer, the next unit must be labelled so that it can be reached. The value of the final unit, or of a unit preceding anEXIT, determines the value of the serial-clause.
