高精度阶乘运算，可以计算到很大的值，弥补了使用int型变量带来的数值限制-Precision factorial operation can be calculated to a large value, to make up for the numerical limit the use of int type variables to bring the

一个简单的高精度计算器模拟程序,基于Windows编程,可以计算超长位数字的计算-A simple calculator simulation program has high precision, based on the Windows programming, super long digit calculation can be calculated