Testing a module with $monitor 

//test for behaviorial AND2 module

module tester;

reg in1,in2;

wire out;

AND2 a2(in1,in2,out); //instantiate AND2 module

initial begin //Generate test data

in1 = 0; in2 = 0;

#1 in2 = 1;

#1 in2 = 0; in1 =1;

#1 in2 = 1;

#1 $finish;

end

initial begin // header

$monitor("Time=%0d in1=%b in2=%b out=%b",$time, in1, in2, out);

end

endmodule

Need to use registers here for stable monitoring

Constantly monitors input. Will display info at every input change

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