POSIX Function: Tests whether a string is a valid constant name.
USE IFPOSIX
result = PXFISCONST (s)
s |
(Input) Character. The name of the constant to test. |
The result type is logical. The PXFISCONST function confirms whether the argument is a valid constant name that can be passed to functions PXFCONST and IPXFCONST. It returns .TRUE. only if IPXFCONST will return a valid value for name s.
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