设信号ＣＨ表示计算路程脉冲，每０.１公里变化一个周期．出租车三公里内为起步价７.０元，超过三公里，每公里２.４元．设置一个开车键，停止状态按动一次表示开车，开车状态按动一次表示下车．一个暂停键，暂停是停止收费，再次按动继续收费．七段码显示当前价格和路程．且所有七段码为动态显示．

如果有谁会的话，帮帮忙吧，写些主要的程序就行了-Established that the calculation of CH distance signal pulse, 0.1 kilometers of each cycle changes. Taxi prices starting at 3 kilometers for 7.0 yuan, more than three kilometers, 2.4 yuan per kilometer. Set up a car key, once pressed, said the stalled car, activated the first time that the car off state. A PAUSE, the suspension is to stop the charges, fees and charges once again pressed to continue. Seven-Segment code shows the current price and distance. Seven-Segment and all code for dynamic display. Who, if so, you help out, write the main program on the list