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NOR

In the last task you have coded a so-called NAND (Not AND) gate. NAND gates are a standard component in digital electronics. Any Boolean function can be implemented by using a combination of NAND gates. Here you will get to know another standard gate, the NOR (Not OR) gate.

Exercise

Write a function nor that takes two Boolean values. If both values are false, the result should be true. In the other cases the return should be false. The call nor(false, false) should return true. The calls nor(true, false), nor(false, true) and nor(true, true) should return false.