Write a function that when passed a grade average will return the letter-grade based on a 90/80/70/60 grade scale.

Explanation:

The following code is written in Java and creates a function called letterGrade. This function takes an int parameter for the number grade given. Then it takes that number grade and puts it through a switch function which will compare the number to the correct case and output the corresponding letter grade.

public static char letterGrade (int numberGrade) {

       char grade = ' ';

       switch (numberGrade) {

           case 90:

               grade = 'A';

               break;

           case 80:

               grade = 'B';

               break;

           case 70:

               grade = 'C';

               break;

           case 60:

               grade = 'D';

               break;

           default:

               System.out.println("Grade must be 90/80/70/60");

       }

       return grade;

   }

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