这是一个简单的计算器设计，是用单片机做的，里面有能在keil软件里运行的程序，还有仿真图-This is a simple calculator is designed to do with single-chip, which are able to run keil software program, as well as simulation of Figure

基于AT89C51单片机计算器数字输入显示模拟设计 第一次按下时，显示“D1”；第二次按下时，显示“D1D2”；第三按下时，显示“D1D2D3”，8个全显示完毕，再按下按键下时，给出“嘀”提示音。-Based on AT89C51 microcontroller digital input display analog calculator designed for the first time, when pressed to show " D1" second time,