计算器，实现的实数的加，减法乘法以及除法等一些的基本运算，还有平方等更高级一点的运算-Calculator, plus real numbers, subtraction, multiplication, and division achieved some of the basic operations, there are square, and other more advanced computing

计算器主要用于一些数据的计算，除了加减乘除，还有比较高级的诸如百分号，分数之类的计算。-The calculator is mainly used for the calculation of some data, addition subtraction multiplication and division, as well as more advanced, such as the percent sign, the fraction of such calculation.