The purpose of this method is to store the currently displayed number into the accumulator, to store the specified operation as well, and to reset the display for input of the next operand.
此方法的目的就是：将目前所显示的数值存储到此累加器、存储特定的操作以及为了下一个操作数的输入而重置显示。
The purpose of this method is to store the currently displayed number into the accumulator, to store the specified operation as well, and to reset the display for input of the next operand.
此方法的目的就是：将目前所显示的数值存储到此累加器、存储特定的操作以及为了下一个操作数的输入而重置显示。
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