实现支付床整数的相加，是最长只有30位数的加法运算-Effecting payments the sum of the integers of the bed, is the longest of only 30 digits adder

四位逐次进位加法器的verilog实现。附tb.v文件。单片机开发，数字逻辑与处理器基础实验-Four successive carry adder verilog implementation. Tb.v attached file. SCM development, digital logic and processor basic experiment