`timescale 1ns/1ns module calculation( input clk, input rst_n, input [3:0] a, input [3:0] b, output wire [8:0] c ); wire [7:0] a8,a4; wire [7:0] b4,b1; wire [8:0] c_wire; reg [8:0] c1,c2; assign a8 = a<<3; assign a4 = a<<2; assign b4 = b<<2; assign c_wire= (a8+a4+b4+...