编写一位全加器的程序，生成器件后用BLOCK画出bdf图，最终成为四位全加器。此为实验报告，里面包括原理及框图及源程序。-Preparation of a full adder program, after generating device using BLOCK draw bdf map, eventually become four full adders. This is a test report, which includes the principle and block diagram and source code.