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Numbers and Strings

The basic vocabulary of X-PLOR knows about numbers and character
strings. Note that the following definitions are special cases
of words.
**complex:==( real , real)**- is a complex number.
**integer:==**- is a positive or negative integer number, including zero.
**logical:==**- is a logical variable, i.e., TRUE or FALSE. ON and OFF can be used in place of TRUE and FALSE, respectively.
**real:==**- is a floating-point number.
**string:==**- is a sequence of characters enclosed in double quotation marks. Note that in instances where the sequence of characters uniquely defines a word, the quotation marks can be left out. There are exceptions to this rule in the vector and evaluate statements; it is recommended to use quotation marks with strings in these statements.

*Xplor-NIH 2024-09-13*