class Review
{
	public static void main(String[] args)
	{
		//Q: list datatypes - int
		int a, b, c;
		double x, y, z;
		String s1, s2;
		boolean go = true;	// initialization

		// assignment: =
		a = 12;
		b = 7;
		c = 50;
		x = 1.1;
		y = 1.2;
		z = 1.3;
		s1 = "VWC";
		s2 = "USA";

		// == != > >= < <=
		//Q: if go is true, make s1 be s2. Otherwise, make s2 be s1.
		if(go)
			s1 = s2;
		else	s2 = s1;

		//Q: if a is greater than y, let s1 be s2. O, let s2 be s1.
		if(a > y)
			s1 = s2;
		else	s2 = s1;

		// for, while
		// Q: sum up 15 for 15 times, output the result (15 + 15 + .. + 15)
		int sum = 0;
		//for(int i=0; i<15; i++)
		//	sum += 15;

		//Q: sum up y value for a times: 1.2 + 1.2 + ... + 1.2
		double sum1 = 0;
//		for(int i=0; i<a; i++)
//			sum1 += y;

		// use while-loop
		int i = 0;
		while(i<a)
		{
			sum1 += y;
			i++;
		}

		// 15x15 with while loop.
		i=0;
		while(i<15)
		{
			sum += 15;
			i++;
		}

		// 10 x 10 x 10
		sum = 0;
		for(int m=0; m<10; m++)
			for(int n=0; n<10; n++)
				sum += 10;

		System.out.println(sum + "\n\nDone.\n\n");
	}
}