Hackerrank , 30 Days of Code Challenges ( Day 12 Solution)

 Day 12: Inheritance    :

class Student extends Person{
    private int[] testScores;
    Student(String firstName, String lastName, int identification , int [] scores)
        {
        super(firstName,lastName,identification );
        this.testScores=scores;
    }

    public String calculate()
        {
        int sum =0;
        for(int i : this.testScores)
            {
            sum+=i;
        }
        double avg= sum/testScores.length;
        if (avg<=100 && avg>=90)
            {
            return "O";
        }else if(avg<90 && avg>=80)
            {
             return "E";
        }
        else if(avg<80 && avg>=70)
            {
             return "A";
        }
        else if(avg<70 && avg>=55)
            {
             return "P";
        }
         else if(avg<55 && avg>=40)
            {
             return "D";
        }
        else{
             return "T";
        }
    }

}