#include<iostream.h>
#include<fstream.h>
#include<stdlib.h>
#include<iomanip.h>
#include<math.h>

void summary(double x,double y,double f);
void difference(double x1,double y1,double x2,double y2,int W,int R);
void briefsum(int t);
void test(int x);
double angle(double x1,double y1,double x2,double y2);
double unitvector(double x1,double y1,double x2, double y2);
void purevector(double x1,double y1,double x2,double y2,int W,int R);
double vvector(double y1,double y2,int O,double y3,int T);
void warning();
double truevalue(double Y1, double Y2,double F1,double M1);
double tensiontest2(double R1, double Xnew,double Xold,double F1,double M1);
void value1(double X);
double bestvector(double y1,double y2,int O,double y3,int T);