/*
 **************************************************************************
 * Program name : 036_Vertical_Bar_chart (Version 1.00)                   *
 * Author       : Duck Wong                                               *
 * Language     : C / C++                                                 *
 * Compiler     : Boodshed Dec-C++ compiler Ver 3.95                      *
 * Computer     : PII350                                                  *
 * O/S          : Windows 98                                              *
 **************************************************************************
 * Version 1.00 : 2000/06/10 - first version                              *
 **************************************************************************
 * Description  : (a) Input the test results                              *
 *                (b) Plot the bar chart                                  *
 *                (c) Try again ?                                         *
 **************************************************************************
*/
#include <iostream.h>
#include <stdlib.h>
#include <iomanip.h>

int main()
{
 // part 1 : declaration
 int   Num_student, Marks, Index, Max;
 int   Grade_A, Grade_B, Grade_C, Grade_D, Grade_E, Grade_U;
 char  again;

 do {
     // part 2 : Read the marks of each student
     cout << "\n   Please enter the test result of the students "
          << " (9999 means stop): \n\n";
     Grade_A = Grade_B = Grade_C = Grade_D = Grade_E = Grade_U =0;
     for (Index=1; Index<=40; Index++)
       {
        cout << "\tstudent no. " << setw(2) << Index << " : ";
        cin  >> Marks;
        if (Marks==9999) break;                                      // Note (1)
        else if (Marks < 0 || Marks >100) Index -= 1;                // Note (2)
        else if (Marks < 41) Grade_U +=1 ;
        else if (Marks < 51) Grade_E +=1 ;
        else if (Marks < 61) Grade_D +=1 ;
        else if (Marks < 71) Grade_C +=1 ;
        else if (Marks < 81) Grade_B +=1 ;
        else Grade_A +=1 ;
       };
     Index -=1;                                                      // Note (3)

     // part 3 : Find the max number
     Max = Grade_A;
     if (Grade_B > Max) Max = Grade_B;
     if (Grade_C > Max) Max = Grade_C;
     if (Grade_D > Max) Max = Grade_D;
     if (Grade_E > Max) Max = Grade_E;
     if (Grade_U > Max) Max = Grade_U;

     // part 4 : Draw the bar chart
     cout << "\n\n\tTotal number of student : " << Index << "\n";
     cout << "\n\t---------------------";
     for (Index=Max; Index>=1; Index--)
       {
        cout << "\n\t    " << setw(2) << Index << " : ";
        if ((Grade_A<Index) ?  cout << "  " : cout << "* ");         // Note (4)
        if ((Grade_B<Index) ?  cout << "  " : cout << "* ");
        if ((Grade_C<Index) ?  cout << "  " : cout << "* ");
        if ((Grade_D<Index) ?  cout << "  " : cout << "* ");
        if ((Grade_E<Index) ?  cout << "  " : cout << "* ");
        if ((Grade_U<Index) ?  cout << "  " : cout << "# ");
       }
     cout << "\n\t---------------------"
          << "\n\t Grade : A B C D E U"
          << "\n\n\tPass : " << Grade_A+Grade_B+Grade_C+Grade_D+Grade_E
          << "\tFail : " << Grade_U
          << "\n\n";

     // part 5 : try another number ?
     cout << "\t\aTry another number (Y/N) : ";
     cin  >> again;
     cout << "\n";
   } while (again=='Y' || again=='y');
 cout << "\n" << endl;

 system("PAUSE");
 return 0;
}

/* Notes
   (1) When the inputted marks is equals to 9999, that means no more record.

       Example :
         student no.  6  :9999

   (2) When Marks belows zero or greater than 100, then the value of "Index"
       is decreased by 1 and then start next loop.

       Example :
         student no.  6  :956
         student no.  6  :95

   (3) Number of valid enteries is the current value of Index less One.

   (4) The statement if ((Grade_A<Index) ?  cout << "  " : cout << "* ");
       is equal to :

       if (Grade_A<Index)
         cout << "  ";
       else cout << "* ";
*/