Functions are requests that return values for various common services. PDL functions are documented in the "Symbolic Debugger Commands" chapter.
All PDL function names start with a dollar sign, for example, $NUMBER. You invoke functions by coding the function name at the point in the program where the value is needed. Any parameters required are enclosed in parentheses.
The four types of built‑in functions are numeric, alphanumeric, Boolean, and pseudo functions. "Types of Operands for PDL Functions" appendix contains a listing of the PDL built‑in functions by type and shows what types of operands can be used with each function.
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