完成4*6的键盘输入，将输入的数据显示在5位数码管上，并要求由左到右轮流显示，最左边显示最后键入的数据，最高位数据丢失-The completion of 4* 6, keyboard input, the input data is displayed in the five digits, and requested by the left-to-right rotation showed that the far left shows the final type of data, high data loss