Permutations

permutations.java

class Permutations
{
	public static void main (String[] args)
	{
	
		if (args.length == 0 || args.length == 1)
		{System.out.println("Not enough arguments supplied");
		System.exit(0);}
		else if (args.length > 2)
		{System.out.println("Too many arguments");
		System.exit(0);}
		
	// chars is the number of different characters
	// length is the length of passphrase
	
		int chars = Integer.parseInt(args[0]);
		int length = Integer.parseInt(args[1]);

		long result = (long)(Math.pow(chars, length))*(length+1);
		System.out.println(result + " Bytes");
		System.out.println(result / 1024L + " Kilobytes");
		System.out.println(result / 1048576L + " Megabytes");
		System.out.println(result / 1073741824L + " Gigabytes");
		System.out.println(result / 1099511627776L + " Terabytes");
		System.out.println(result / 1125899906842624L + " Petabytes");
	}
}