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Section 6: Subprograms -- TOC

(1)

A subprogram is a program unit or intrinsic operation whose execution is invoked by a subprogram call. There are two forms of subprogram: procedures and functions. A procedure call is a statement; a function call is an expression and returns a value. The definition of a subprogram can be given in two parts: a subprogram declaration defining its interface, and a subprogram_body defining its execution. Operators and enumeration literals are functions.

(2)

A callable entity is a subprogram or entry (see Section 9). A callable entity is invoked by a call; that is, a subprogram call or entry call. A callable construct is a construct that defines the action of a call upon a callable entity: a subprogram_body, entry_body, or accept_statement.

Clauses and Subclauses

1. Subprogram Declarations
2. Formal Parameter Modes
3. Subprogram Bodies -- TOC
   1. Conformance Rules
   2. Inline Expansion of Subprograms
4. Subprogram Calls -- TOC
   1. Parameter Associations
5. Return Statements
6. Overloading of Operators

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