// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/02/Inc16.hdl

/**
 * 16-bit incrementer:
 * out = in + 1 (arithmetic addition)
 */

CHIP Inc16 {
    IN in[16];
    OUT out[16];

    PARTS:
    HalfAdder(a=in[0], b=true, sum=out[0], carry=ha1carry);
    HalfAdder(a=in[1], b=ha1carry, sum=out[1], carry=ha2carry);
    HalfAdder(a=in[2], b=ha2carry, sum=out[2], carry=ha3carry);
    HalfAdder(a=in[3], b=ha3carry, sum=out[3], carry=ha4carry);
    HalfAdder(a=in[4], b=ha4carry, sum=out[4], carry=ha5carry);
    HalfAdder(a=in[5], b=ha5carry, sum=out[5], carry=ha6carry);
    HalfAdder(a=in[6], b=ha6carry, sum=out[6], carry=ha7carry);
    HalfAdder(a=in[7], b=ha7carry, sum=out[7], carry=ha8carry);
    HalfAdder(a=in[8], b=ha8carry, sum=out[8], carry=ha9carry);
    HalfAdder(a=in[9], b=ha9carry, sum=out[9], carry=ha10carry);
    HalfAdder(a=in[10], b=ha10carry, sum=out[10], carry=ha11carry);
    HalfAdder(a=in[11], b=ha11carry, sum=out[11], carry=ha12carry);
    HalfAdder(a=in[12], b=ha12carry, sum=out[12], carry=ha13carry);
    HalfAdder(a=in[13], b=ha13carry, sum=out[13], carry=ha14carry);
    HalfAdder(a=in[14], b=ha14carry, sum=out[14], carry=ha15carry);
    HalfAdder(a=in[15], b=ha14carry, sum=out[15], carry=false);
}