数值分析作业，用拉格朗日插值多项式求解函数-Numerical analysis, operations, using Lagrange interpolation polynomial function

采用VC++，针对获得的GPS数据进行拉格朗日插值，获取某一时刻的位置信息。-Using VC++, Lagrange interpolation for GPS data were obtained, to obtain location information of a moment.