3、four wires

Practice: Create a module with 3 inputs and 4 outputs that behaves like wires that makes these connections: a->w，b->x，b->y，c->z.

翻译：用wire进行连接，注意一一对应。

module top_module(

input a,b,c,

output w,x,y,z );

assign w = a;

assign x = b;

assign y = b;

assign z = c;

endmodule

切记：out可以有多个，但in通常只有一个!