in c, logical false is reresented by any zero value and true by any nonzero value. here is

8/9/2019 In C, Logical False is Reresented by Any Zero Value and True by Any Nonzero Value. Here Is

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8. initializer::=assignment_expression | initializer_list,

9. initializer_list::=List(initializer),

10. declarator_initialized::=declarator ("=" initializer),

Structs and Unions

11. structure_declarator::=declarator | declarator ":" constant_expression,

12. structure_declarator_list::=List(structure_declarator),

13. structure_declaration::=(type_specifier | type_qualifier) structure_declarator_list ";" ,

14. struct_union_specifier::=struct_union identifier | struct_union identifier

"{"structure_declarator_list "}",

15. struct_union::=( "struct" | "union" ),

Enums16. enumeration_value::=enumeration_constant ("=" constant_expression|)

17. enumeration_list::=List(enumeration_value ),

18. enumeration_specifier::=enumeration_identifier | "enum" identifier

"{"enumeration_list"}",

Functions

19. function_definition::=declaration_specifier declarator | declaration_list |

compound_statement,

20. parameter_declaration::=#declaration_specifier declarator | abstract_declarator,

21. parameter_list::=List(parameter_declaration) (",..."|),

Main Function

A complete C program has to have a function with name 'main'. This is the function

called by the operating system. It must return an int value indicating whether the prograam executed

correctly or if there was an error. In UNIX, the main program returns 0 to indicate no errors. Their

are several valid forms:

22. int main()

23. int main(argc, argv)24. int main(argc, argv, envp) The parameters are set up by the operating system when the

program starts. The traditional arg stands for argument.

Pointers

25. pointer::=#( "*" | #type_qualifier),

26. declarator::=pointer | direct_declarator,

Functions and Arrays

27. post_declarator::="["constant_expression"]" | "("parameter_list")" | "("identifier_list")"

28. direct_declarator::=identifier | "("declarator")" | direct_declarator post_declarator,


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29. abstract_declarator::=pointer | pointer direct_abstract_declarator,

30. direct_abstract_declarator::= "(" abstract_declarator ")" | O( direct_abstract_declarator)

O("[" O(constant_expression) "]" | "(" O(parameter_list) ")" ),

. . . . . . . . . ( end of section Declarations)

Statements1. statement::=labeled_statement | compound_statement | expression_statement |

selection_statement | iteration_statement | jump_statement

Branch

2. jump_statement::="goto" identifier";" | "continue" ";" | "break;" | "return" expression

";",

Structured

3. loop::=iteration_statement.

4. iteration_statement::="while" "("expression")" statement | "do" statement "while"

"("expression")" ";" | for_statement.

5. for_statement::="for" "("expression ";" expression ";" expression")" statement,

6. selection_statement::=if_statement | "switch" "("expression")" statement,

7. if_statement::="if ("expression")" statement | "if" "("expression")" statement "else"

statement.

8. expression_statement::= expression ";",

9. labeled_statement::=identifier ":" statement | "case" constant_expression ":" statement |

"default" ":" statement,

Compound

10. compound_statement::=block | "{" #statement "}",

11. block::="{" declaration #declaration #statement "}",

. . . . . . . . . ( end of section Statements)

Pre-Processor Commands

1. preprocess_token::=identifier | constant | string_literal | operator | punctuator | each

Non-white space not one of the previous,

2. header_char::=any character except new_line | and | >,

3. header_name::=#(header_char),

4. new_line::=new_line character,

5. Left_paren::=left parenthesis with no white space before it,

6. control_line::="#include" (#(preprocess_token | header_name) new_line | "#define"

identifier #(preprocess_token) new_line | "#define" identifier left_paren identifier_list

#(preprocess_token) new_line, | "#undef" identifier new_line | "#line" preprocess_token new_line |

"#error" preprocess_token new_line | "#pragma" preprocess_token new_line | "#"new_line,

7. endif_line::="#endif" new_line,


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8. elif_group::="#elif" constant_expression new_line pp_group,

9. else_group::="#else" new_line pp_group,

10. if_group::=("#if" constant_expression | "#ifdef" identifier | "#ifndef" identifier)

new_line pp_group,

11. if_part::=if_group #(elif_group) else_group endif_line,

12. pp_part::=#preprocess_token new_line | if_part | control_line,

13. pp_group::=#(pp_part),

. . . . . . . . . ( end of section Pre-Processor Commands)

. . . . . . . . . ( end of section Syntax of The C Programming Language)

End


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in c, logical false is reresented by any zero value and true by any nonzero value. here is

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