Concatenation operators combine two terms into one. The terms can be strings, variables, expressions, or constants. Concatenation can be significant in formatting output.
SAY true blue /* result is TRUE BLUE */
(8 / 2)||(3 * 3) /* result is 49 */
per_cent'%' /* if per_cent = 50, result
is 50% */
You can use abuttal
only with terms that are of different types, such as a literal string
and a symbol, or when only a comment separates two terms.