传回值为一个小于或等于其数字引数的最大整数值。

The return value is an integer value equal to the greatest integer less than or equal to its numeric argument.

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将其数值按二进制数在P 1口驱动LED灯上显示出来。2、外部事件计数脉冲由P 3.4引入定时器t0。

Its value according to the binary number displayed on the P1 mouth drive leds. 2, external event count pulse introduced by P3.4 T0 timer.

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