4位数码管显示时间，可以显示年（2009-2099）、月、日、时、分、秒、跑秒。自动计算闰年平年、每月天数。调时间时，被调对象可增可减，能自动变化增减速率。按键带双击功能。还有其他的较多功能详见源码。-4 digital display of time, you can display year (2009-2099), month, day, hour, minute, second, run second. Automatic calculation of leap year average

C51计算器源码，能计算简单的加减乘除。内带Proteus仿真图。可在Proteus软件下直接仿真-C51 calculator source code, to calculate simple addition and subtraction, multiplication and division. Simulation of the map with Proteus. Can be directly simulated in the Proteus software