public class GradeCalc {
    public static void main(String[] args) {
        if (args.length != 1) {
            System.out.println("Usage: java GradeCalc <gradeFile>");
            return;
        }

        In rawGrades = new In(args[0]);
        Out averages = new Out("averageGrades.txt");
        while (!rawGrades.isEmpty()) {
            String name = rawGrades.readString();
            double averageGrade = 0.0;
            for (int i = 0; i < 4; i++) {
                averageGrade += rawGrades.readDouble();
            }
            averageGrade /= 4.0;
            averages.printf("%s %.1f%n", name, averageGrade);
        }
    }
}