java 本系统给人们提供更加方便和快捷的计算工具——计算器，程序实现了计算器的基本功能有：加、减、乘、除等基本算术运算，除此之外，还包括％，开方，1/X等运算，它与计算机系统中自带的计算器比较相似。-java the system to provide people with more convenient and faster calculation tools- calculator, a calculator program to achieve the basic functions are: add, subtract, multiply, with the exception of the basic arithmetic operations, in addition, also includes the open side, 1/X, such as computing, computer systems with built-in calculator similar.