显示部分可用LCD（液晶）或数码管或点阵，有键盘输入。可以正确显示输入内容，包括正负数。能进行数据之间简单的加减乘除运算，包括float型有清零功能，可以删除错误输入内容。-Part of the available display LCD (liquid crystal) or digital tube or lattice, a keyboard input. You can display the input is correct, including the positive and negative numbers. Between the data can be simple arithmetic operations, including the float type has clear function, you can delete the incorrect entry.