// This program uses nested if/else statements to assign a
// letter grade (A, B, C, D, or F) to a numeric test score.
#include <iostream>
using namespace std;

int main()
{
   // Constants for grade thresholds
   const int A_SCORE = 90,
             B_SCORE = 80,
             C_SCORE = 70,
             D_SCORE = 60;

   int testScore;  // To hold a numeric test score

   // Get the numeric test score.
   cout << "Enter your numeric test score and I will\n";
   cout << "tell you the letter grade you earned: ";
   cin >> testScore;
   
   // Determine the letter grade.
   if (testScore >= A_SCORE)
   {
      cout << "Your grade is A.\n";
   }
   else
   {
       if (testScore >= B_SCORE)
       {
           cout << "Your grade is B.\n";
       }
       else 
       {
           if (testScore >= C_SCORE)
           {
               cout << "Your grade is C.\n";
           }
           else 
           {
               if (testScore >= D_SCORE)
               {
                   cout << "Your grade is D.\n";
               }
               else
               {
                   cout << "Your grade is F.\n";
               }
           }
       }
   }

   return 0;
}