Subprograms

The programmer may define subroutines and functions. The name of a function may appear in a type declaration statement to indicate the type of its result.

Functions are used inside of expressions, and are called whenever used.

There are also a number of special type-declaration statements to describe characteristics peculiar to functions and which appear in the calling program.

• The NILADIC Statement
• The MATHEMATICAL Statement
• The GUARD Statement
• The SEQUENTIAL_GUARD Statement
• The FUNCTION Statement
• The SUBROUTINE Statement
• The OPERATOR Statement
• The LEFT_FUNCTION Statement
• The ENTRY Statement
• The XFUN Statement
• The XSUB Statement
• The XLFN Statement
• The XOPR Statement
• The PSUB Statement
• The PFUN Statement
• The PLFN Statement
• The POPR Statement
• The DEFINE Statement