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LOGIC GATES & THE FULL ADDER

Learn each gate from its truth table, then see how a handful of gates combine into a circuit that adds binary digits.

Single gate

0
AND
0
= 0
Click the input squares to toggle them. The matching row of the truth table lights up.

Full adder — add three bits (A + B + carry-in)

Click the A, B and Cin inputs on the left. Green wires carry a 1; gates glow when their output is 1. Sum and Cout together form a 2-bit result.