New PDF release: ADA An Introduction: Ada Reference Manual (July 1980)

By Henry Ledgard (auth.)

ISBN-10: 0387905685

ISBN-13: 9780387905686

ISBN-10: 1468401262

ISBN-13: 9781468401264

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

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DAY 1 LAST) of INTEGER; HOURS_WORKED: WORK_DATA; An intrinsic property of each array is that it has indices. The allowable indices are specified by giving a range of discrete values. For example, we may have the array type definitions: array (DAY 1 FIRST .. DAY 1 LAST) of INTEGER array (MON . SUN) of INTEGER array (DAY) of INTEGER Each of these definitions is equivalent. The indices are the values MON through SUN of type DAY. For any array A, the lower bound of its first index is denoted with the attribute A 1 FIRST, the upper bound with A 1 LAST.

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.

Thus some safeguards are necessary if we wish to ensure the integrity of information. This brings up the issue of private information, in particular the use of objects whose type is specified as a private type. Consider the following package: package SIMPLE_I_O is type FILE_NAME is private; procedure CREATE (F: out FILE_NAME); procedure READ (F: in FILE_NAME; ITEM: out INTEGER); procedure WRITE (F: in FILE_NAME; ITEM: in INTEGER); private type FILE_NAME is range 0 .. _NAME, and can pass these variables to the procedures CREATE, READ, and WRITE.

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


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