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You now know that, whenever the character ! is followed immediately
by the character =, the two characters together denote the
inequality operator.
Note, however, that the ! character can appear alone, in
which case the ! character denotes the
not operator. The not operator is a unary operator that
inverts true and false. Thus, the value of !0 is 1 and
!1 is 0. Similarly, the value of !(6 == 3) is
1, meaning that it is true that 6 is equal to 3 is
false. Also, the value of !(6 != 3) is 0, meaning that it is
false that 6 is not equal to 3 is false.