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In C and C++, the ! negates the result:
if( !( a == b ) )
In Scheme, I found only eq?. How do I say "not equal"? Or we have to explicitly say
(eq? #f (eq? expr expr))
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To negate a Boolean expression you simply have to apply the DeMorgan theorem recursively: (1) The negation of a sum is the product of the negated variables. (2) The negation of a product is the sum of the negated variables.
Scheme provides us with at least three useful logical operators: AND, OR, and NOT. The only value in Scheme that "means" false is #f. All other values are interpreted as true (including the empty list).
Scheme has a not, so you could do: (not (eq? expr1 expr2))
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