Having problems with OOP C++

vanko25 (1)
Hello guys! Happy New year! I am having some issues with the following code, I am just not able to see where I am wrong. Can you please help me? Thanks in advance!

This is the header file:
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//CAS.h

#ifndef _CAS_H
#define _CAS_H

#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <string>
using namespace std;



const double P0 = 1013.25; 
const double a0 =  661.48;
const int barlength = 80;
int LINES = -1;
double maxvalue;



class CASHistory
{
public:
double calcSpeed(double l);
int CountLines(char name);
void CasCalc();
void CasDisp();
void CasHis();
CASHistory();
virtual ~CASHistory();
};

struct FlightParams    
{

int time;           
double pressure;     // value read from data file
double speed;        // calculated from pressure

} fltparams;

#endif


This is the .cpp 

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#include "CAS.h"
#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <string>
using namespace std;
using std:: cout;
using std:: getline;

CASHistory::CASHistory(void)
{

}

CASHistory::~CASHistory(void)
{
}  
void CASHistory::CasHis()
{   ifstream fin;
bool reRun;
string buf;
do {
      system("cls"); 
      string filename;  
      cout << "Please enter the file name:" << endl;
      getline(cin,filename);
      fin.clear();
      fin.open(filename.c_str());
      if (!fin.fail()){
            cout << "\nCAS History Plot(seconds,knots)\n\n";}
      else {
            cout << "\nPlz check your input file name!\n\n";}
      void CASHistory::CasCalc()
      { 
            ifstream infile;    
            char filename;

            infile.open(filename,ios::in);      
            LINES=CountLines(filename);
            for(int i=0;i<LINES;i++)
            {
                  infile>>fltparams.time;
                  infile>>fltparams.pressure;
            }
      }
      double CASHistory:: calcSpeed(double l);       
      {
            double sp;
            sp=a0*sqrt(5*(pow((l/1000)/P0+1,2.0/7)-1));
            cout<<"speed="<<sp<<endl;
            return 0;
      }
      int CASHistory::CountLines(char name)
      {
            ifstream ReadFile;
            int n=0;
            string temp;
            ReadFile.open(name,ios::in);   
            if(ReadFile.fail())              {
                  return 0;
            }
            else{

                  while(getline(ReadFile,temp))
                  {
                        n++;
                  }
                  return n;
            }
            ReadFile.close();
      }
      fin.close();
      void CASHistory::CasDisp()
      {

            double j=0;
            double   max;
            max=fltparams.speed;
            for (int o = 0;o<LINES;o++)

            {
                  if(max < fltparams.speed)
                  {
                        max   =   fltparams.speed;        
                  }
            }
            maxvalue=max;

            for (int z=0;z<LINES;z++)
            {
                  double sf;
                  sf=fltparams.speed/(maxvalue/barlength);
                  cout << right;
                  cout.fill('*');
                  cout<<setw(sf);
                  cout<<fltparams.time<<","<<fltparams.speed<<endl;
            }
      }
      reRun = false;
      cout << "Re-run (Y/N):" << endl;
      char tmp;
      while (cin >> tmp && tmp != 'Y' && tmp != 'y' && tmp != 'N' && tmp != 'n');
      if (tmp == 'Y' || tmp == 'y') reRun = true;
      getline(cin, buf);
} while (reRun);
cout << "End of program execution!" << endl;
}


And the main.cpp itself

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#include <cstdlib>
#include "CAS.h"
#include <string>
using namespace std;


int main(void) {

   CASHistory cashistory;
   cashistory.CasHis();

   system("pause");
   return 0;
   }
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