Verilog - NOT Gate

 not_gate.v

module and_gate(a,y);
input a;
output y;

not(y,a);
endmodule

tb_not_gate.v

module tb_not_gate;
reg a;
wire y;

not_gate UUT (.a(a), .y(y));

initial begin
$display(“Testing NOT gate”);

a = 0;
#10;
$display(“Input_A = %b, Output = %b”, a,y);

a = 1;
#10;
$display(“Input_A = %b, Output = %b”, a,y);

$finish;
end
endmodule

The output waveform for not gate will be as follows: