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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Special-variables/PL-I/special-variables.pli Normal file
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Special variables in PL/I are termed "Pseudo-variables".
They are used only on the LHS of an assignment statement.
They include:
REAL to assign the real part of a COMPLEX variable;
IMAG to assign the imaginary part of a COMPLEX variable;
SUBSTR is used to assign part of a string (used on the LHS of an assignment);
STRING when used on the left-hand of an assignment;
UNSPEC used to assign a bit pattern to a variable;
ENTRYADDR is used to assign an address to an ENTRY variable that is
to be invoked;
ONCHAR resets the current value of the CHAR built-in function (when
a data conversion error occurs, and it is desired to re-attempt
the conversion);
ONSOURCE assigns a new value to the ONSOURCE built-in function
(may be used when a data conversion error occurs,
and a re-try of the conversion is to be attempted with modified data);
ONGSOURCE assigns a new value to the ONGSOURCE built-in function
(may be used when a data conversion error occurs,
and may be used when a re-try of the conversion is to be
attempted with modified data).