Compare the string specified by c-addr₁ u₁ to the string specified by c-addr₂ u₂. The strings are compared, beginning at the given addresses, character by character, up to the length of the shorter string or until a difference is found. If the two strings are identical, n is zero. If the two strings are identical up to the length of the shorter string, n is minus-one (-1) if u₁ is less than u₂ and one (1) otherwise. If the two strings are not identical up to the length of the shorter string, n is minus-one (-1) if the first non-matching character in the string specified by c-addr₁ u₁ has a lesser numeric value than the corresponding character in the string specified by c-addr₂ u₂ and one (1) otherwise.