Keil C语言编写大数除法，乘法，加法，减法，十进制转换二进制程序，数据长度可以按照需要修改。-Keil C language division of large numbers, multiplication, addition, subtraction, decimal conversion binary data length can be modified as needed.

国防工业大学8051单片机的一些代码，包括中断，大数乘法等 -National Defense University 8051 some of the code, including interrupt the multiplication of large numbers and so on

1.所有已知错误除大数乘法外皆解决 2.添加按键音 3.解决老版本缓冲区清空问题 4.添加类似windows计算器的/=功能（即自身作为第二个操作数） 5.目前小数仅保留4位以内-1. All known bugs are solved outside except multiply large numbers 2. Add the key tone 3. Solve the problem the old version of the buffer empty 4.