计算器的c实现代码，可以实现计算器的一些功能，模拟windows操作系统中的计算器-a jisuanqi de shixian

线性规划算法，用C语言开发，可以在多种不同的操作系统上编译运行-Mixed Integer Linear Programming (MILP) solver lp_solve solves pure linear, (mixed) integer/binary, semi-cont and special ordered sets (SOS) models.lp_solve is written in ANSI C and can be compiled on many different pl

C++矩阵处理工具——Eigen3工具包，其内部封装了很多矩阵类，可以在C++环境轻松进行矩阵处理（与操作系统无关，window，linux均可）。(C++ matrix processing tool - Eigen3 toolkit, which encapsulates a lot of matrix classes, can be easily carried out in the C++ environment matrix processing (unrelated to the o