6 Subprograms
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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.]
statement
.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
.