计算器是用LCD显示，按键输入数据，能进行简单的加减乘除运算，最大数据位8位，支持小数运算。万年历用的是DS18B20芯片，用LCD显示时分秒，温度及制作人的名字。-Calculator with LCD display, keyboard input data, can be a simple add, subtract, multiply and divide operation, maximum 8 data bits, support decimal arithmetic. Calend

单片机多字节乘法，实现32位乘以32位整形数据相乘，然后把64位结果高32位和低32位分别存放。带Protues仿真文件，已验证算法结果-Microcontroller multibyte multiplication, 32 times the 32-bit plastic data multiplication, and the results the 64 high 32 bits and low 32-bit storage respectively. Protues simulati