Popcount3

A "population count" circuit counts the number of '1's in an input vector. Build a population count circuit for a 3-bit input vector.

solution

module top_module( 
    input [2:0] in,
    output [1:0] out );
    always @(*) begin
        out = 0;
        for (integer i=0;i<3;i++) begin
            if (in[i]) out = out + in[i];
        end
    end
endmodule