Delphi4 Object Pascal language guide

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Directives Directives have special meanings in Object Pascal, but, unlike reserved words, appear only in contexts where user-defined identifiers cannot occur. Hence— although it is inadvisable to do so—you can define an identifier that looks exactly like a directive. 2 Directives absolute dynamic name protected resident abstract export near public safecall assembler external nodefault published stdcall automated far overload read stored cdecl forward override readonly virtual contains implements package register write default index pascal reintroduce writeonly dispid message private requires Syntactic elements 4-3 Fundamental syntactic elements Numerals Integer and real constants can be represented in decimal notation as sequences of digits without commas or spaces, and prefixed with the + or – operator to indicate sign.

The left-parenthesis–plus–asterisk and asterisk–plus–rightparenthesis—(* *)—are equivalent to the left and right brace—{ }. , \, _ (underscore), |(pipe), and ~ (tilde) are not special characters. Identifiers Identifiers denote constants, variables, fields, types, properties, procedures, functions, programs, units, libraries, and packages. An identifier can be of any length, but only the first 255 characters are significant. An identifier must begin with a letter or an underscore (_) and cannot contain spaces; letters, digits, and underscores are allowed after the first character.

Indexes Strings, arrays, array properties, and pointers to strings or arrays can be indexed. For example, if FileName is a string variable, the expression FileName[3] returns the third character in the string denoted by FileName, while FileName[I + 1] returns the character immediately after the one indexed by I. For information about strings, see “String types” on page 5-9. For information about arrays and array properties, see “Arrays” on page 5-16 and “Array properties” on page 7-18. Typecasts It is sometimes useful to treat an expression as if it belonged to different type.

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