实现17位加法，利用一个16位超前进位加法器和一个一位全加器构成的一个有进位输入和进位输出的17加法器，并且16位加法器利用的使四位超前进位加法器构成。它在booth乘法器设计中经常用到。可以使初学者对模块的调用了解更加透彻。-Adder 17 to achieve the use of a 16-bit CLA, and a one-bit full adder composed of a binary input and binary output of the adder 17, and

实现各种加法器的功能，包括4位及8位超前进位，4位及8位逐次进位加法-The various adder functions, including four and eight lookahead, 4-bit and 8-bit successive-carry adder

加法器，减法器，乘法器，超前进位，一位拓展成四位-adder and subber are written by the language of VerilogHDL one bit to four bits.