public void grade(Course[][] courses)
	{
		System.out.print("Enter semester to enter grade: ");
		int semester = scan.nextInt();
		System.out.print("Enter course number to enter grade: ");
		int course = scan.nextInt();
		
		if( semester > courses.length || course > courses[semester].length || courses[semester][course] == null)
		{
			System.out.println("Invalid location.");
		}
		else
		{
			System.out.print("Enter grade: ");
			String temp = scan.next();
			courses[semester][course].setGrade(temp.charAt(0));
			temp = scan.nextLine();
		}
		
	}