计算器软件DEMO,进行简单的加减乘除运算 -Calculator software DEMO

ios计算器，能够实现加减乘除基本运算，同时可以计算优先级，括号等复杂运算，非常适合新手学习Ios~-ios calculator, to achieve the basic operations of addition, subtraction, multiplication and division, and at the same time can be calculated priority, brackets and other complex operations, ideal fo