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Data. Data is declared with no actual range in the Statistics package, the programmer must specify beginning and ending index values. Ada allows starting indexes other than zero. The defined index for an array type may even include a range of negative values. The expression, Stat_Data'Range in the loop specification, indicates that the loop will traverse the entire array, beginning with the first value through the last value.

In fact, a single program is usually composed of many packages. A package is a module for collecting related information and services. It can be thought of as a contract for services. The user of that contract may be thought of as a client. In this sense, a client may us some of the services but not want to use all of those services. Ada allows a client to indentify only those services needed, through its visibility rules, even though all services might be in scope and potentially visible. The services are in the form of type definitions, data declarations, and subprograms.

2/2 Tip: This is one of those powerful Ada syntactic constructs that can make code more readable and easier to maintain. Sometimes you want a simple membership test. The in and not in options permit testing membership of a value within a type or type range. Membership test is permitted for any data type. 20 then Result := True; end if; return Result; end Continue; --------- 1 Parameterized function 2 Initialized return variable. 451; -- Derived type; derived from Standard Integer procedure Demand (Data : in out Bounded_Integer'Base) is Local : Bounded_Integer'Base := 0; begin -- Demand Data := Data + Local; if Data in Bounded_Integer then null; end if; end Demand; ---------- 1 Procedure Identifier 2 Parameter list for Base type 3 Initialized variable.

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