实现简单自动售货机的基本功能。投币找零功能，并用Led数码管显示，输出结果用Led显示。-Basic functions simple vending machines. Coin change for function and use Led digital tube display, the output display Led.

7段共阳极数码管，译码显示，Verilog HDL程序-Code based on Verilog HDL