// This file is part of the materials accompanying the book 

// "The Elements of Computing Systems" by Nisan and Schocken, 

// MIT Press. Book site: www.idc.ac.il/tecs

// File name: projects/02/HalfAdder.hdl



/**

 * Half adder. Computes sum, the least significnat bit of a + b,

 * and carry, the most significnat bit of a + b.

 */



CHIP HalfAdder {



    IN  a, b;

    OUT sum,   // LSB of a + b

        carry; // MSB of a + b



    PARTS:

    Xor(a=a, b=b, out=sum);

    And(a=a, b=b, out=carry);

}