more logic gates

题目：

Ok, let's try building several logic gates at the same time. Build a combinational circuit with two inputs, a and b.
There are 7 outputs, each with a logic gate driving it:

代码如下：

module top_module( 
    input a, b,
    output out_and,
    output out_or,
    output out_xor,
    output out_nand,
    output out_nor,
    output out_xnor,
    output out_anotb
);
	assign out_and=a&b;
    assign out_or=a|b;
    assign out_xor=a^b;
    assign out_nand=~(a&b);
    assign out_nor=~(a|b);
    assign out_xnor=~(a^b);
    assign out_anotb=a & (~b);
endmodule