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Declaration-free programs
Prerequisite Concepts		Related Syntax

Declaration-free programs are very useful for quick programs that are used a few times and then discarded. They are also convenient for prototyping parts of a large system.

Declaration-free programs have the following restrictions:

• They must contain the declare heralded-names declaration.
• The variable type switch, counter, stream or pattern must precede a variable name whenever it is used in any context that allows variables of different types.
• They may not contain functions. Without declarations, there is no way of declaring functions.
• They may not contain local variables. All variables in a declaration-free program are assumed to be global.

Wherever this documentation indicates an optional type herald, that herald is required for declaration-free programs.

Prerequisite Concepts      Counters    Declarations    Function types and anatomy    Heralds    Switches

Related Syntax    declare heralded-names    pattern

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