// 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/03/a/PC.hdl

/**
 * A 16-bit counter with load and reset control bits.
 * if      (reset[t] == 1) out[t+1] = 0
 * else if (load[t] == 1)  out[t+1] = in[t]
 * else if (inc[t] == 1)   out[t+1] = out[t] + 1  (integer addition)
 * else                    out[t+1] = out[t]
 */

CHIP PC {
    IN in[16],load,inc,reset;
    OUT out[16];

    PARTS:
    // Put your code here:
    Mux16 (a=out5, b=in, sel=load, out=out0);
    Inc16 (in=out0, out=out1);
    Mux16 (a=out1, b=out0, sel=load, out=out2);
    Mux16 (a=out0, b=out2, sel=inc, out=out3);
    Mux16 (a=out3, b=false, sel=reset, out=out4);
    Register (in=out4, load=true, out=out5, out=out);

    //Inc16 (in=out4, out=out0);
    //Mux16 (a=out4, b=out0, sel=inc, out=out1);
    //Mux16 (a=out1, b=in, sel=load, out=out2);
    //Mux16 (a=out2, b=false, sel=reset, out=out3);
    //Register (in=out3, load=true, out=out4, out=out);
}