public class StudentGrade
{
    int numResit = 0;
    int numPass = 0;
    int numDistinction = 0;

    public void run()
    {
        Scanner key = new Scanner(System.in);
        int studMark = 0;

        for(;;)
        {
            System.out.println("Enter a students mark! Enter negative to finish.");
            studMark = key.nextInt();
            if(studMark < 0) break;
            if(studMark < 40) numResit++;
            else if(studMark < 70) numPass++;
            else numDistinction++;
        }

        System.out.println("Resits: " + numResit + " Passes: " + numPass + " Distinctions: " + numDistinction);

    }
}