/*
 **************************************************************************
 * Program name : 019_Horizontal_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;
 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 : \n";
     Grade_A = Grade_B = Grade_C = Grade_D = Grade_E = Grade_U =0;
     for (Index=1; Index<=40; Index++)
       {
        cout << "   Student no. " << setw(2) << Index
             << "   the marks is (9999 means stop) :";
        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 :
     cout << "\n\n     Total number of student : " << Index << "\n";
     cout << "\n     Grade  Students";
     cout << "\n    --------------------------------------------";
     cout << "\n       A  | ";
     for (Index=1; Index<= Grade_A; Index++) cout << "* ";
     cout << "\n       B  | ";
     for (Index=1; Index<= Grade_B; Index++) cout << "* ";
     cout << "\n       C  | ";
     for (Index=1; Index<= Grade_C; Index++) cout << "* ";
     cout << "\n       D  | ";
     for (Index=1; Index<= Grade_D; Index++) cout << "* ";
     cout << "\n       E  | ";
     for (Index=1; Index<= Grade_E; Index++) cout << "* ";
     cout << "\n       U  | ";
     for (Index=1; Index<= Grade_U; Index++) cout << "U ";
     cout << "\n    --------------------------------------------";
     cout << "\n\n";

     // part 4 : try another number ?
     cout << "\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   the marks is (9999 means stop) :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.  5   the marks is (9999 means stop) :456
         Student no.  5   the marks is (9999 means stop) :45

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