# for-repeating time is determined # while()-repeating time is unknow # case 1: controller inside while loop x=1 while(True): print(x) x=x+1 # add a controller if (x==3): print(x) continue x=x-1 if(x==7): break else: print("loop exit normally") #case 2: controller at while condional) while (x<10): print("second while loop:",x) x=x+1 else: print("second loop exit normally")