Turbo Pascal® version 6.0 programmer's guide

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For reasons of speed and code size, only operations on variables of type real are allowed in this state. Any attempt to compile statements that operate on the Single, Double, Extended, and Comp types generates an error. 8087 floating point In the {$N+} state, the code generated performs all real type calculations using 8087 instructions. This state permits the use of all five real types. For further details on 8087 floating-point code generation and software emulation, refer to Chapter 74, "Using the 8087.

Procedural types For a complete discussion of procedural types, refer to the "Procedural types' section on page 108. Standard Pascal regards procedures and functions strictly as program parts that can be executed through procedure or function calls. Turbo Pascal has a much broader view of procedures and functions: It allows procedures and functions to be treated as objects that can be assigned to variables and passed as parameters. Such actions are made possible through procedural types. A procedural type declaration specifies the parameters and, for a function, the result type.

A string type declared without a size attribute is given the default size attribute 255. The length attribute's current value is returned by the standard function Length. 27 string type ~~'I'""-------------_-+I lcD---1 unsigned integer ~ The ordering between any two string values is set by the ordering relationship of the character values in corresponding positions. In two strings of unequal length, each character in the longer string without a corresponding character in the shorter string takes on a higher or greater-than value; for example, 'xs' is greater than 'x'.

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