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Variable of boolean type are defined by the keyword bool . They can contain a constant value of either true or false;
!(logical negation)&&(logical conjunction, "and")||(logical disjunction, "or")==(equality)!=(inequality)
The operators || and && apply the common short-circuiting rules. This means that in the expression f(x) || g(y), if f(x) evaluates to true, g(y) will not be evaluated even if it may have side-effects.
The following comparison operators <= (less than or equal), < (less than), ==, !=, >=, > evaluate to a boolean value.