说明：  键盘输入，1062lcd显示，加法、减法（负数不行）、乘法、除法器（若是减法、乘法、除法需先加一次。。。） 初学所写，不足请改进。
(Keyboard input, 1062lcd showed that addition, subtraction (not negative), multiplication, division browser (if subtraction, multiplication, division to be added to a...) Beginner book, not even requested the improvement.)