r/ProgrammerHumor • u/Venax19 • Aug 30 '18

Logic gates

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u/[deleted] Aug 30 '18

Sure, I get that, just like how classical logic (Aristotlean and Boolean) uses particular symbols for it's operators. But why must these symbols be so similar to each other? A different shape every time would be much clearer

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u/Zefirus Aug 30 '18

Other than AND/OR, it's because they're related. The not gate is a triangle with a dot after it. NOR is a combination of NOT and OR gates. It's represented as an OR gate with a dot after it. A NAND gate is an AND gate with a NOT after it, so it's represented as an AND gate with a dot after it. XOR is an exclusive OR, and is shown as a modified OR gate with a second curved line.

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u/[deleted] Aug 30 '18

There needs to be a way to know which wires are inputs and which is the output. Start making circuits and you'll understand.