FN - source-solutions/HELP GitHub Wiki

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result = FN[ ]name [(arg_0 [, arg_1] ...)

Evaluates the user-defined function previously defined with DEF FN name. Spaces between FN and name are required.

• name is the name of a previously defined function.
• arg_0, arg_1, ... are expressions, given as parameters to the function.

• In Microsoft BASIC, spaces between FN and name are optional.
• Unlike Microsoft BASIC, in SE Basic IV, functions can be called recursively, albeit without tail call optimization.

• No function named name is defined: Undefined user function.
• The number of parameters differs from the function definition: Syntax error.
• The type of one or more parameters differs from the function definition: Type mismatch.
• The return type is incompatible with the function name's sigil: Type mismatch.