单片机按钮防抖C语言程序

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key为按键,规定按下为低电平if(key==0){delay(50); //延时50ms,消抖    if(key==0) //再判断是否按下   {      while(!key); 松手检测··················································该按键按下要实现的功能程序··················································     }}我的习惯是这样写