Ada Programming/Keywords/declare

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This keyword is used to mark beginning of the declarative part of a block.

Block_Name :
   declare
      A_Variable : The_Type;
   begin
      Use A_Variable
   end Block_Name;

The Block_Name is optional.

See also

Wikibook

Ada 95 Reference Manual

Ada 2005 Reference Manual

Ada Quality and Style Guide

3.1.3 Capitalization

`abort`	`else`	`new`	`return`
`abs`	`elsif`	`not`	`reverse`
`abstract` (Ada 95)	`end`	`null`
`accept`	`entry`		`select`
`access`	`exception`	`of`	`separate`
`aliased` (Ada 95)	`exit`	`or`	`some` (Ada 2012)
`all`		`others`	`subtype`
`and`	`for`	`out`	`synchronized` (Ada 2005)
`array`	`function`	`overriding` (Ada 2005)
`at`			`tagged` (Ada 95)
	`generic`	`package`	`task`
`begin`	`goto`	`pragma`	`terminate`
`body`		`private`	`then`
	`if`	`procedure`	`type`
`case`	`in`	`protected` (Ada 95)
`constant`	`interface` (Ada 2005)		`until` (Ada 95)
	`is`	`raise`	`use`
`declare`		`range`
`delay`	`limited`	`record`	`when`
`delta`	`loop`	`rem`	`while`
`digits`		`renames`	`with`
`do`	`mod`	`requeue` (Ada 95)	`xor`

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