这是我在ISP编程实验中独立编写的采用结构化描述的四位全加器，通过四次映射一位全加器的方式实现了四位全加器的功能，并附有数码显示模块，将全加器的运算结果输出到数码管显示。-This is my ISP programming experiment in the preparation of an independent structural descr iption of the four full-adder, through the four mapping of a full adder