Scheme Exercises
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Group: Exercise: 17/48
Three-part function (2):
A function with three different behaviors (using cond)
Create a function called "three-cond", whose signature is (three-cond w), that has the value -1 if w < 0, and has the value 3.5 if 0 <= w and w <= 4, and has the value 7 otherwise.
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