数值计算中经典方法的C语言通用程序。包含LU分解法，复化辛普森法，改进欧拉法，拉格朗日插值法，列主元素法，牛顿迭代法，最小二乘法拟合和四阶龙格-库塔法，支持文件读写。-The code is the classic method of numerical calculation of the C language common procedures. Including LU decomposition, re-oriented Simpson method, Improved Euler me