Download Essential Pascal by Marco Cantù PDF

By Marco Cantù

Crucial Pascal is an advent to the fundamental gains of the Pascal language, as present in Delphi and different sleek improvement instruments, from the simplest promoting writer of getting to know Delphi.

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Ordinal Types Routines There are some system routines (routines defined in the Pascal language and in the Delphi system unit) that work on ordinal types. They are shown in the following table: Dec Decrements the variable passed as parameter, by one or by the value of the optional second parameter. Inc Increments the variable passed as parameter, by one or by the specified value14. Odd Returns True if the argument is an odd number. Pred Returns the value before the argument in the order determined by the data type, the predecessor.

Val Converts a string into a number (traditional Turbo Pascal routine, available for compatibility). Str Converts a number into a string, using formatting parameters (traditional Turbo Pascal routine, available for compatibility). StrPas Converts a null-terminated string into a Pascal-style string. This conversion is automatically done for AnsiStrings in 32-bit Delphi. ) StrPCopy Copies a Pascal-style string into a null-terminated string. This conversion is done with a simple PChar Marco Cantù, Essential Pascal 46 - Chapter 3: Types, Variables, and Constants cast in 32-bit Delphi.

27 As an alternative to New and Dispose you can use GetMem and FreeMem. According to the Delphi help, however, “it is considered preferable to use the New and Dispose procedures”. Marco Cantù, Essential Pascal Chapter 4: User-Defined Data Types - 57 Here is a code snippet28: var P: ^Integer; begin // initialization New (P); // operations P^ := 20; writeln (P^); // termination Dispose (P); end; If a pointer has no value, you can assign the nil value to it. Then you can test whether a pointer is nil to see if it currently refers to a value.

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