Making an alarm turn off when you press a button..

Projects Programming
3 
  if (h==8 && m==30 && s==0 && B==1){
    do{
      tone(sound,330);
    }
    while(B==1);

You never change B. If b==1 it goes into the loop and stays there while B==1. If B is supposed to be the value read from the switch, the read the value in the loop (ie, set B = digitalRead(yourPin); ).