/************************************************************
 *
 *       FileName: loopDW.cpp
 *       Purpose:  Demonstrate how to use Do-while Statement.
 *
 **************************************************************/
#include <iostream>
using namespace std;

int main()
{
   int mark;
   char grade;

   cout << "Please enter an integer mark: "  << endl;

   // Please add a do-while loop below to make sure a valid mark 
   // between [0, 100] is entered before continuing to the if-else if-else




   if (mark >= 85)
   {
      grade = 'A';
      cout << "Great Mark. " << endl;
   }
   else if (mark >= 75 && mark < 85) 
   {
      grade = 'B';
      cout << "Good Mark. " << endl;
   }
   else if (mark >= 65 && mark < 75) 
   {
      grade = 'C';
      cout << "Average Mark. " << endl;
   }
   else if (mark >= 50 && mark < 65) 
   {
      grade = 'D';
      cout << "You passed the class. " << endl;
   }
   else 
   { 
      grade = 'F';
      cout << "You failed the class. " << endl;
   }

   cout << "The corresponding character grade is " << grade << endl;

   return 0;
}
// end program