SIMPLE ASCENDING SORT, EXIT,FLOAT..... NEWBIE

i posted this question and i got replies which solved my problem... partly
here is the link
http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/Q_20646266.html
i am bringing this up because i deparately need a solution.
thanks for all ur efforts..
   
 i tried to impliment  reborn_assassin's program in to my program which is below
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// AUTHOR--SAM
#include <iostream.h>
#include <fstream.h>

#include <conio.h>
//include <stdlib.h>



fstream datafile;
// declaring the file object so that it can communicate with the operating system

    int max=0,min=9999,i;
    float ave,sum2;
    long sum=0;
    int* contents;  // declares variable to read data from file
    char filename[16],words[80];
    double input;
    int keypress,anykey, count=0;

    void exit_prog()
    {
     cout<<"program terminated"<<endl;


    }
 //------------------- Welcom Screen Function-------------------//
    int welcome()
{
    gotoxy(15,5);
    cout<<"****************************************";
    gotoxy(15,6);
    cout<<"*\t\t   ------- COLLEGE\t     *";
    gotoxy(15,7);
    cout<<"*\t        FILE PROCESSING SYSTEM          *";
    gotoxy(15,8);
    cout<<"*\t\t PRESS C TO CONTINUE\t     *";
    gotoxy(15,9);
    cout<<"*                                      *";
    gotoxy(15,10);
    cout<<"****************************************";
    gotoxy(34,9);
    keypress=getche();
    stop:

return 0;
}
//----------------------Menu Screen Function----------------------//
int menu()
{  clrscr();
    gotoxy(15,5);
    cout<<"****************************************"<<endl;
    cout<<"\t      *\t\tFile Processing System\t     *"<<endl;
    cout<<"\t      *     \t  Please input option        *"<<endl;
    cout<<"\t      *                            \t     *"<<endl;
    cout<<"\t      * 1----------Create new data file      *"<<endl;
    cout<<"\t      * 2----------Input data to a file      *"<<endl;
    cout<<"\t      * 3----------View numbers form a file  *"<<endl;
    cout<<"\t      * 4----------Display maximum\t     *"<<endl;
    cout<<"\t      * 5----------Display minimum\t     *"<<endl;
    cout<<"\t      * 6----------Display total\t     *"<<endl;
    cout<<"\t      * 7----------Display the Average value *"<<endl;
    cout<<"\t      * 8----------Ascending sort \t     *"<<endl;
    cout<<"\t      * 9----------EXIT  \t\t     *"<<endl;
    cout<<"\t      *                            \t     *";
    gotoxy(15,18);
    cout<<"****************************************"<<endl;
    gotoxy(34,8);
    keypress=getche();

return 0;
}
//-------------OPTION 1 CREATE FILE---------------------------//
int create_file()
{
    // asking user to input name of the file to create
 cout<<"please enter the name of the file that you wish to create"<<endl;
 cout<<"use .txt as your file extension\n";

 cin>>filename;
 cout<<"\nA file named "<<filename<<" was created"<<endl;
 datafile.open(filename,ios::out);

 datafile.close(); // close file
return 0;
}


//-------------OPTION 2 INPUT DATA TO A FILE---------------------------//
int input_data()
{

// asking user to input name of the file to input data to
 cout<<"please enter the name of the file that you wish to input data to"<<endl;
 cout<<"please use the correct extension\n";

 cin>>filename;

     do
     {
         count++;
         datafile.open(filename,ios::app);
         clrscr();
         cout<<"input number";
         cin>>input;
         datafile<<input<<endl;
         datafile.close();
         cout<<("do you want to input another number... press anykey to continue or N to exit\n");

         keypress=getch();

         }while(keypress!=110&&keypress!=78);

         clrscr ();
         cout<<"You entered "<<count<<" numbers\n"<<endl;

return 0;

}
//-------------OPTION 3 VIEW DATA FORM A FILE---------------------------//
int view_file()
{

      // asking user to input name of the file from which the data needs to reviewed
 cout<<"please enter the name of the file which you wish to view the contents"<<endl;
 cout<<"please use the correct extension\n";
 cin>>filename;
    datafile.open(filename,ios::in);      // open numbers.txt file for reading

     while(!datafile.eof())  // keeps reading till the end of file
     {
         datafile.getline(words,80,'\n'); // read character by character form file ito words

         cout<<words<<endl;    // displays characters on the screen

     };

     datafile.close(); // close file
return 0;
};
//-------------OPTION 4 Maximum---------------------------//

int maximum()
{         contents= new int[count];
    datafile.open(filename,ios::in);      // opens numbers.txt file for reading
// displaying the contents of the file
    for(i=0;i<count;i++)  // keeps reading till the end of file
     {
         datafile>>contents[i]; // read character by character form file  ito words

         cout<<contents[i]<<endl;    // displays characters on the screen

     };

 // find and display max
    for(i=0;i<count;i++)
    {
                   if(contents[i]>max)
                        max=contents[i];
    }
    cout<<"max is "<<max<<"\n";

 datafile.close();
return 0;
}
//-------------OPTION 5 MINIMUM---------------------------//
int minimum()
{     contents= new int[count];
    datafile.open(filename,ios::in);      // opens numbers.txt file for reading
// displaying the contents of the file
    for(i=0;i<count;i++)  // keeps reading till the end of file
     {
         datafile>>contents[i]; // read character by character form file  ito words

         cout<<contents[i]<<endl;    // displays characters on the screen

     };
    //find and display min
    for(i=0;i<count;i++)
    {
         if(contents[i]<min)
              min=contents[i];
     }
     cout<<"min is "<<min<<endl;
 datafile.close(); // close file
    return 0;
}





//-------------OPTION 6 TOTAL---------------------------//
int total()
{
      contents= new int[count];
    datafile.open(filename,ios::in);      // opens numbers.txt file for reading
// displaying the contents of the file
    for(i=0;i<count;i++)  // keeps reading till the end of file
     {
         datafile>>contents[i]; // read character by character form file  ito words

         cout<<contents[i]<<endl;    // displays characters on the screen

     };
 // calcualte and display sum
    for(i=0;i<count;i++)
         sum=sum+contents[i];

    cout<<"sum is "<<sum<<"\n";

    datafile.close(); // close file
return 0;
}

//-------------OPTION 7 AVERAGE---------------------------//
int average()
{     contents= new int[count];
    datafile.open(filename,ios::in);      // opens numbers.txt file for reading
// displaying the contents of the file
    for(i=0;i<count;i++)  // keeps reading till the end of file
     {
         datafile>>contents[i]; // read character by character form file  ito words

         cout<<contents[i]<<endl;    // displays characters on the screen

     };
    // calclate and display average
    sum=sum2;
    ave=sum2/count;
    cout<<"average is "<<ave<<endl;
    datafile.close(); // close file
return 0;
}
//-------------OPTION 8 SORT---------------------------//
int sort()
{
         char ans;
         contents= new int[count];
         int tp, i, j, total;
         total =  sizeof(contents)/4; // Meaning you can change the size of the array
         for (i=1; i<=total-1; i++)
              {
              for (j=i+1; j<=total; j++)
                   {
                     if (contents[i] > contents[j])
                        {
                              tp = contents[i];
                              contents[i] = contents[j];
                              contents[j] = tp;
                        }
                   }
              }
     for (i=1; i<=total; i++)
                   cout << endl << contents[i];
     cin >> ans;

return 0;
}


//-------------MAIN PROGRAM---------------------------//

int main()
{

    welcome();
    while(keypress!=67||keypress!=99)
    {
         if (keypress==99||keypress==67)
         {
              menu();
              while(keypress!=49||keypress!=50||keypress!=51||keypress!=52||keypress!=53||
                        keypress!=54||keypress!=55||keypress!=56||keypress!=57)
              {
                   if(keypress==49||keypress==50||keypress==51||keypress==52||keypress==53||
                        keypress==54||keypress==55||keypress==56||keypress==57)
                        {
                             if(keypress==49)
                                  {            //----- OPTION 1------//
                                       clrscr();
                                       create_file();
                                       cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                       anykey=getch();
                                   }
                             if(keypress==50)
                                  {          //----- OPTION 2------//
                                  clrscr();
                                  input_data();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==51)
                                  {            //----- OPTION 3------//
                                  clrscr();
                                  view_file();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==52)
                                  {            //----- OPTION 4------//
                                  clrscr();
                                  maximum();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==53)
                                  {           //----- OPTION 5------//
                                  clrscr();
                                  minimum();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==54)
                                  {           //----- OPTION 6------//
                                  clrscr();
                                  total();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==55)
                                  {          //----- OPTION 7------//
                                  clrscr();
                                  average();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==56)
                                  {         //----- OPTION 8------//
                                  clrscr();
                                  sort();
                                  cout<<"\n\n\t\t\tPress Any Key To Return to Main Menu";
                                  anykey=getch();
                                  }
                             if(keypress==57)
                                  {        //----- OPTION 9------//
                                  clrscr();
                                  cout<<"\a"<<endl;
                                  cout<<"Thank you for using our program"<<endl;
                                  cout<<"We hope you enjoyed it";

                                  cout<<"\n\n\t\t\tPress Any Key exit the program";
                                  anykey=getch();
                                  break;

                                                       //exit(0);
                                  }

                         }


                   cout<<"\a";
                   clrscr();
                   menu();
              }// end while of menu validation
         }

         cout<<"\a";
         clrscr();
         welcome();

    }//end while of welcome validation

return 0;
}
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there are 3 problem with my program...
1) the sort code provided by reborn_Assasin---- i ttried but i could'nt integrate his proram into mine.. i tried to look for the problem but iam having difficulty.
2) the exit function dosent work..  in the opt9.. i tried to puta  break; but  it only goes back to the welcome screenn. .
also i tried to put exit(0);  there fore included stdlib.h as header.. but for no apparent reason it gives me  9 errors.. . please could soemone  provide me with a solution for this.
3) the average option---.  initially  my ave was an int .which gave me an int value. .but when i changed it to float .all it gives me is 0..(i wanted a decimal value)
 please help
 thank you..