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.
有些指令包含立即操作数值，它们被直接编码到指令中。
Some of the instructions include immediate operand values that are directly encoded into the instruction.
一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。
Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
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