Description: Four digital tube display the current time. After midnight when the display format of " sub-seconds display by the LED flashing do. Using the button to set the time and trouble-ling, and can display the trouble-ling time. When the trouble-ling time to the buzzer sounds, trouble-ling sound can press the stop button to stop. Development: the digital clock alarm to music. (Electronic tone generator)
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电子时钟.c
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