Download ADA An Introduction: Ada Reference Manual (July 1980) by Henry Ledgard (auth.) PDF

By Henry Ledgard (auth.)

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Additional info for ADA An Introduction: Ada Reference Manual (July 1980)

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These constructs are familiar to all programmers, but in Ada you will find them especially well-designed. 1 EXPRESSIONS An expression is a formula for computing a value. The basic elements of an expression are typified by the following examples: a numeric value a boolean value an enumeration value a string value an aggregate value TRUE MON "ILLEGAL SYMBOL" (1 .. 10 => 0) ------ INDEX TEXT(! -- the value of a variable -- the value of an array component 2 + 1) A(l .. 10) LENGTH(TOKEN) A'FIRST -- a slice of an array -- the value of a function call -- the value of an attribute Introduction to Ada 25 Strings Strings are the basic units for describing messages and text, and thus have an important role in many applications, especially those with extensive input and output.

Like any service, it may rely on internal data and services that are not (and should not be) exposed to the user. 1 THE VISIBLE INFORMATION Every package is specified by giving a list of declarative information. This declarative information can be made accessible to a user, and is called its visible part. 609; This simple package defines a collection of four constants. We can readily imagine providing a more complete list of such constants, including those for areas and volumes as well as those for weights.

This textual embedding or program units is called nesting. Nesting serves several programming objectives. Most importantly, it allows a logical organization for program units. An analogy may be made with an encyclopedia, where the materials are organized into subjects and subsubjects. Accordingly, related units can be grouped and maintained together, at the level where they are needed. Nesting also allows us to give local names for locally declared objects, independently of any outer use of the names.

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