URAL1030[Titanic]

注意精度，然后看图：

CODE:

/*

PROGRAM: $PROGRAM

AUTHOR: Su Jiao

DATE: 2010-3-20

DESCRIPTION:

$DESCRIPTION

*/

#include <iostream>

using std::cin;

using std::cout;

#include <fstream>

using std::ifstream;

using std::ofstream;

#include <sstream>

using std::stringstream;

using std::endl;

#include <vector>

using std::vector;

#include <string>

using std::string;

using std::getline;

#include <stack>

using std::stack;

#include <queue>

using std::queue;

#include <set>

using std::set;

#include <map>

using std::map;

using std::pair;

using std::make_pair;

#include <algorithm>

using std::sort;

#include <cmath>

using std::cos;

using std::acos;

//using std::M_PI;

#define M_PI (3.141592653589793238462643383279f)

#include <cassert>

//using std::assert;

#include <iomanip>

 

class Application

{

      double sx,sy,ix,iy;

      void get(string& s,double& d)

      {

           if (s.substr(0,4)==“and “) s.erase(0,4);

           stringstream cin(s);

           d=0;

           double get;

           cin>>get;

           cin.ignore();

           d+=get;

           cin>>get;

           cin.ignore();

           d+=get/60.0;

           cin>>get;

           cin.ignore();

           d+=get/3600.0;

           char flag;

           cin>>flag;

           if (flag==’N’||flag==’E’)

           {

              d=-d;

           }

      }

      double d(double get)

      {

             if (get>0) get=-get;

             if (get>180.0) get=360.0-get;

             return get;

      }

      public:

      Application()

      {

      }

      int run()

      {

          string s;

          getline(cin,s);//Message #<n>.

          getline(cin,s);//Received at <HH>:<MM>:<SS>.

          getline(cin,s);//Current ship’s coordinates are

          getline(cin,s);//<X1>^<X2>'<X3>” <NL/SL>

          get(s,sx);

          getline(cin,s);//and <Y1>^<Y2>'<Y3>” <EL/WL>.

          get(s,sy);

          getline(cin,s);//An iceberg was noticed at

          getline(cin,s);//<A1>^<A2>'<A3>” <NL/SL>

          get(s,ix);

          getline(cin,s);//and <B1>^<B2>'<B3>” <EL/WL>.

          get(s,iy);

          getline(cin,s);//===

         

          sx=sx/180.0*M_PI;

          sy=sy/180.0*M_PI;

          ix=ix/180.0*M_PI;

          iy=iy/180.0*M_PI;

         

          const double R=(6875*0.5);

          double d=R*acos(sin(sx)*sin(ix)+cos(sx)*cos(ix)*cos(sy-iy));

          cout<<“The distance to the iceberg: “

              <<std::setiosflags(std::ios::fixed)

              <<std::setprecision(2)

              <<d

              <<” miles.”<<endl;

          string stream;

          int get;

          stringstream scout(stream);

          scout<<std::setiosflags(std::ios::fixed)

               <<std::setprecision(2)

               <<d;

          stringstream scin(scout.str());

          scin>>get;

          if (get<100) cout<<“DANGER!”<<endl;

          return 0;

      }

};

 

int main()

{

    Application app;

    return app.run();

}