Changing Number to Letter Grades

 char findLetter(int score);
 int main() { int score; //taken as user input
 char grade;
 printf("\tEnter your numberical score: ");
 scanf("%i", &score); 
 grade=findLetter(score);
 printf("Your grade is a %c", grade);
 return 0;
         }
 char findLetter(int score) 
      { 
        switch(score/10)
          { case 10: 
              { return 'A'; break; }
            case 9: 
             { return 'A'; break; }
             case 8: 
               { return 'B'; break; }
             case 7: 
               { return 'C'; break; }
            case 6: 
             { return 'D'; break; }
              case 5: 
               { return 'D'; break; }
             default:
               { return 'E'; break;}
         }
       }