module test_signed(a, b, c, d, y); input [3:0] a, b, c; input signed [3:0] d; output reg [7:0] y; always @* begin if (a && b) y = c; else y = d; end endmodule module test_const(a, y); input [3:0] a; output reg [28:0] y; always @* case (a) 4'b0000: y = 0; 4'b0001: y = 11; 4'b0010: y = 222; 4'b0011: y = 3456; 4'b0100: y = 'b10010010; 4'b0101: y = 'h123abc; 4'b0110: y = 'o1234567; 4'b0111: y = 'd3456789; 4'b1000: y = 16'b10010010; 4'b1001: y = 16'h123abc; 4'b1010: y = 16'o1234567; 4'b1011: y = 16'd3456789; 4'b1100: y = "foobar"; 4'b1101: y = "foobarfoobarfoobar"; 4'b1110: y = 16'h1; 4'b1111: y = a; default: y = 'bx; endcase endmodule