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The %%$ISNUM function indicates whether a specified string is numeric. In order to be considered numeric, the specified string must contain only numeric characters from 0 through 9, because a numeric string cannot contain letters, blanks, or special characters.
Possible values returned by this function are
The format of the %%$ISNUM function is
%%$ISNUM string
In this format, string is the constant or variable that contains the string to evaluate.
Example 1
DO SET %%A = %%$ISNUM 1234
This returns a value of YES.
Example 2
DO SET %%A = %%$ISNUM 12PM
This returns a value of NO.
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