本设计是以STC89C51单片机为核心的计算器模拟系统设计,输入采用4×4矩阵键盘再加上4个独立按键,可以进行加、减、乘、除7位带符号数字运算,同时支持括号的嵌套使用级浮点数的运算,并在LCD1602上显示操作过程。(This design is a calculator simulation system design with STC89C51 MCU as the core. Input 4 * 4 matrix keyboard plus 4 independent keys can add, subtract, multiply and divide the 7 digit numeric operation. At the same time, it supports the operation of the nested floating point number of parentheses and displays the operation process on the LCD1602.)