Editing exponent

==Warning! The use of [[gawkism]]s will prevent the script from running correctly on systems that use a traditional [[awk]] interpreter. **The doublestar exponent operator is not available in traditional implementations** *Traditional [[awk]] implementations do not provide an exponent [[arithmetic]] operator. The [[doublestar]] symbol used here for [[arithmetic]] exponential operations is a [[gawkism]] and will not work in traditional [[awk]]. {{{ }}} **The doublestar gawkism** *The [[doublestar]] gawkism acts as a dyadic exponent [[operator]]. It returns the [[value]] given as a left [[operand]] to the power of the right [[operand]]. The [[operand]]s can be [[floating poin]]t values, producing a [[floating point]] value: {{{awk print (4 ** 3) # 64 (4 to the power of 3) }}} **Precedence** *The exponent operator gawkism has a higher [[precedence]] than all other [[arithmetic]] operators: {{{awk print (2 * 4 ** 3) # 128 the exponent has a higher precedence than multiplication }}} **Exponent Combination Assignment Operator** *The exponent [[combination assignment operator]] gawkism represented by a [[starstarequals]] trigraph, can also be used to perform an exponent calculation: {{{awk value **= 3 # value = value ** 3 }}}

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This change is a minor edit.

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