#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>
#include <string>
#include <stdlib.h>

using namespace std;
float *evaluate ();
void  display ();
void  Min_Max(float *);
int main()
{
float *p;


    evaluate();
    display();

cin.get();

p = evaluate();
Min_Max(p);


    return 0;
}

float *evaluate()
{
  ofstream Out_File("result.txt");
  int n=30;
  float x [n];
  float fx[n];
  float interval = ((4-(-2))/0.2);
  x[0]= -2.0;

    for(n=0;n <= interval;n++)
    {
        fx[n] = 4*exp((-x[n])/2)*sin((2*x[n]- 0.3)*3.14159/180);
        x[n+1] = x[n] + 0.2;

       if (Out_File.is_open())
        {
            Out_File <<setprecision(5)<<setw(8)<<showpoint<<fixed<< x[n];
            Out_File << "\t\t"<<setprecision(5)<<setw(8)<<showpoint<<fixed<<fx[n]<<endl;
        }
       else cout << "Unable to open file";
    }
    Out_File.close();
return fx;
}

void display()
{
      ifstream inFile;
    inFile.open("result.txt");
    string line;
    cout << "    x\t\t\t   f(x)"<<endl;
    cout << "_______________________________________"<<endl;
        while( getline (inFile,line))
        {
            cout<<line<<endl;
        }

    inFile.close();

}

void Min_Max(float *value)
{
    int a=0;
    for(a=0;a<=30;a++){
        cout << *(value+a) <<endl;
        *value =0;}
}