// Helene Martin, CSE 142
// Demonstrates usage of for loops and nested for loops

public class LoopExamples {
	public static void main(String[] args) {
		squares();
		blastoff();
		square();
		mult();
		triangle();
		numTriangle();
		sequence();
	}
	
	public static void squares() {
		for (int i = 1; i <= 6; i++) {
			System.out.println(i + " squared = " + i * i);
		}	
	}
	
	// display the following text using a loop:
	// T-minus 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, blastoff!
	public static void blastoff() {
		System.out.print("T-minus ");
		for (int i = 10; i >= 1; i--) {
			System.out.print(i + ", ");
		}
		System.out.print("blastoff!");
	}
	
	/* display the following grid of stars using for loops:
	 	**********
		**********
		**********
		**********
		**********
	*/
	public static void square() {
		for (int i = 1; i <= 5; i++) {
			//System.out.println("**********");
			for (int j = 1; j <= 10; j++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
	
	// display a multiplication table
	public static void mult() {
		for (int i = 1; i <= 27; i++) {
			for (int j = 1; j <= 10; j++) {
				System.out.print(i * j + "\t");
			}
			System.out.println();
		}
	}

	
	/* display the following triangle:
	*		1
	**		2
	***	3
	****	4
	*****	5
	*/	
	public static void triangle() {
		for (int i = 1; i <= 5; i++) {
			for (int j = 1; j <= i; j++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
	
	/*
	1
	22
	333
	4444
	55555
	*/
	public static void numTriangle() {
		for (int i = 1; i <= 5; i++) {
			for (int j = 1; j <= i; j++) {
				System.out.print(i);
			}
			System.out.println();
		}
	}
	
	/*
	Mapping loop counter to number sequences
	17 13 9 5 1
	
	count		value		count * -4		count * -4 + 21
	1			17			-4					17
	2			13			-8					13
	3			9			-12				9
	4			5			-16				5
				
	*/
	public static void sequence() {
		for (int count = 1; count <= 4; count++) {
			System.out.print(count * -4 + 21 + " ");
		}
	}
}