用逆波兰表达式实现计算器功能的数学头文件及源文件.支持四则运算,括号,负号,三角函数,求余,求幂和阶乘.但未处理大数,所以数值大小有限.-Math header file and source file with Reverse Polish expression calculator function. Supports four operations, brackets, negative numbers, trigonometric functions, modulo exponentiation factorial. Handling large numbers but did not, so numerical size is limited.