#include <stdio.h>#include <math.h>#define SQ(x)   ((x)*(x))#define tol 1.0e-6#define pi  3.1415926void Input5();void Sys5();void Inter5();void Quad5();void Diag5();void Solve();void Out5();int N,L,M,Last[6];char inname[20],outname[20];