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Some Other Control-Flow Constructs: cond, and, and or

We've already seen that the special form if is a kind of expression, which returns a value as well as affecting control flow. Scheme also has cond, a more general conditional construct, and the extended logical operators and and or. These are all value-returning expressions; they're also special forms, not procedures: they control whether expressions get evaluated, depending on the values returned by other expressions.


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