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.