import static dit948.SimpleIO.*;
import static dit948.Random.*;

public class Solutions_Sep5 {

	public static void main(String[] args) {

		//Choose the program you want to run here
		ex12();

	}

	/**
	 * Write a program that randomly generates an integer between 1 and 12 and
	 * displays the English month name January, February, ..., December for the
	 * number 1, 2, ..., 12, accordingly.
	 * 
	 * Hint: Use functions from Random library as described in the IOCheatSheet.
	 */

	public static void ex1() {

		int number = randomInt(12) + 1;

		if (number == 1)
			System.out.println("Month is Januaray");
		else if (number == 2)
			System.out.println("Month is Feburary");
		else if (number == 3)
			System.out.println("Month is March");
		else if (number == 4)
			System.out.println("Month is April");
		else if (number == 5)
			System.out.println("Month is May");
		else if (number == 6)
			System.out.println("Month is June");
		else if (number == 7)
			System.out.println("Month is July");
		else if (number == 8)
			System.out.println("Month is August");
		else if (number == 9)
			System.out.println("Month is September");
		else if (number == 10)
			System.out.println("Month is October");
		else if (number == 11)
			System.out.println("Month is November");
		else
			// if (number == 12)
			System.out.println("Month is December");

	}

	/**
	 * Write an interactive quiz. It should ask the user three multiple-choice
	 * or true/false questions about something. It must keep track of how many
	 * they get right, and print out a "score" at the end.
	 */
	public static void ex2() {
		print("Are you ready for a quiz? (Y\\N): ");

		char inputChar;
		int inputInt;
		int score = 0;

		inputChar = readChar();
		if (inputChar != 'Y')
			return;

		println("\nOkay, here it comes!\n");

		println("Q1) What is the capital of Albania?\n" + "\t1) Sofia\n"
				+ "\t2) Tirana\n" + "\t3) Budapest\n");
		print("> ");
		inputInt = readInt();
		if (inputInt == 2) {
			score += 1;

			println("\nThat's right!\n");
		} else {
			println("Nope, the right answer is Tirana.");
		}

		println("Q2) Can you store the value \"dog\" in a variable of type int?\n"
				+ "\t1) yes\n" + "\t2) no");
		print("> ");
		inputInt = readInt();
		if (inputInt == 2) {
			score += 1;

			println("\nThat's right!\n");
		} else {
			println("Sorry, \"dog\" is a string. ints can only store numbers.\n");
		}

		println("Q3) What is the result of 6+4/2?\n" + "\t1) 5\n" + "\t2) 8\n"
				+ "\t3) 4\n");
		print("> ");
		inputInt = readInt();
		if (inputInt == 2) {
			score += 1;

			println("\nThat's correct!\n");
		} else {
			println("Sorry, 5 is the right answer. \n");
		}

		println("Overall, you got " + score + " out of 3 correct.");
		println("Thanks for playing!");
	}

	/**
	 * Write a program that prompts the user to enter an integer and determines
	 * whether it is divisible by 5 and 6, whether it is divisible by 5 or 6,
	 * and whether it is divisible by 5 or 6, but not both.
	 */

	public static void ex3() {
		// Enter an integer
		print("Enter an integer: ");
		int number = readInt();

		println("Is " + number + " divisible by 5 and 6? "
				+ ((number % 5 == 0) && (number % 6 == 0)));

		println("Is " + number + " divisible by 5 or 6? "
				+ ((number % 5 == 0) || (number % 6 == 0)));

		println("Is " + number + " divisible by 5 or 6, but not both? "
				+ ((number % 5 == 0) ^ (number % 6 == 0)));
	}

	/**
	 * Write a program that simulates picking a (random) card from a deck of 52
	 * cards. Your program should display the rank ( Ace, 2, 3, 4, 5, 6, 7, 8,
	 * 9, 10, Jack, Queen, King ) and suit ( Clubs, Diamonds, Hearts, Spades) of
	 * the card.
	 */

	public static void ex4() {

		final int NUMBER_OF_CARDS = 52;

		// Pick a card
		int number = randomInt(NUMBER_OF_CARDS);

		print("The card you picked is ");
		if (number % 13 == 0)
			print("Ace of ");
		else if (number % 13 == 10)
			print("Jack of ");
		else if (number % 13 == 11)
			print("Queen of ");
		else if (number % 13 == 12)
			print("King of ");
		else
			print((number % 13) + " of ");

		if (number / 13 == 0)
			println("Clubs");
		else if (number / 13 == 1)
			println("Diamonds");
		else if (number / 13 == 2)
			println("Hearts");
		else if (number / 13 == 3)
			println("Spades");

	}

	/**
	 * Write a program that prompts the user to enter the first 9 digits and
	 * displays the 10-digit ISBN (including leading zeros). Your program should
	 * read the input as an integer.
	 */

	public static void ex5() {

		// Prompt the user to enter an integer
		print("Enter the first 9 digits of an ISBN as integer: ");
		int number = readInt();

		// Calculate checksum. You may also write a loop
		int checksum = ((number / 100000000 % 10) * 1
				+ (number / 10000000 % 10) * 2 + (number / 1000000 % 10) * 3
				+ (number / 100000 % 10) * 4 + (number / 10000 % 10) * 5
				+ (number / 1000 % 10) * 6 + (number / 100 % 10) * 7
				+ (number / 10 % 10) * 8 + (number % 10) * 9) % 11;

		print("The ISBN-10 number is ");

		// Display leading zeros, improve the solution using loops
		if (number / 100000000 == 0) {
			print("0");
			if (number / 10000000 == 0) {
				print("0");
				if (number / 1000000 == 0) {
					print("0");
					if (number / 100000 == 0) {
						print("0");
						if (number / 10000 == 0) {
							print("0");
							if (number / 1000 == 0) {
								print("0");
								if (number / 100 == 0) {
									print("0");
									if (number / 10 == 0) {
										print("0");
										if (number == 0) {
											print("0");
										}
									}
								}
							}
						}
					}
				}
			}
		}

		print(number);

		if (checksum == 10)
			print("X");
		else
			print(checksum);

	}

	/**
	 * Use a while loop to find the smallest integer n such that n^2 (n square)
	 * is greater than 12000.
	 */

	public static void ex6() {
		int i = 1;

		while (i * i <= 12000) {
			i++;
		}

		println("This number is " + i);

	}

	/**
	 * Write a program that reads an unspecified number of integers, determines
	 * how many positive and negative values have been read, and computes the
	 * total and average of the input values (not counting zeros). Your program
	 * ends with the input 0. Display the average as a real number.
	 */

	public static void ex7() {
		int countPositive = 0, countNegative = 0;
		int count = 0, total = 0, num;

		print("Enter integers ending with 0: ");
		num = readInt();

		while (num != 0) {
			if (num > 0)
				countPositive++;
			else if (num < 0)
				countNegative++;

			total += num;
			count++;

			// Read the next number
			num = readInt();
		}

		if (count == 0)
			println("no numbers are entered except 0");
		else {
			println("The number of positives is " + countPositive);
			println("The number of negatives is " + countNegative);
			println("The total is " + total);
			println("The average is " + total * 1.0 / count);
		}

	}

	/**
	 * Write a program that asks for a positive integer until the uses enters
	 * one, and calculates the binary representation of that integer. Hint: Use
	 * the modulo operator %
	 */
	public static void ex8() {
		int input, inputOriginal;
		do {
			print("> Enter a positive integer: ");
			input = readInt();
			inputOriginal = input;
		} while (input < 0);

		String bitstring = "";

		while (input > 0) {
			int bit = input % 2;
			int quotient = input / 2;
			bitstring = bit + bitstring;
			input = quotient;
		}

		println("The binary representation of " + inputOriginal + " is "
				+ bitstring);
	}

	/**
	 * Write a program that prompts the user to enter a string and displays the
	 * string in reverse order.
	 */
	public static void ex9() {

		print("Enter a string: ");
		String s = readString();

		String result = "";
		for (int i = 0; i < s.length(); i++) {
			result = s.charAt(i) + result;
		}

		println("The reversed string is " + result);

	}

	/**
	 * Write a program that reads an integer and displays all its smallest
	 * factors in increasing order. For example, if the input integer is 120,
	 * the output should be as follows: 2, 2, 2, 3, 5.
	 */

	public static void ex10() {
		// Prompt the user to enter a positive integer
		print("Enter a positive integer: ");
		int number = readInt();

		// Find all the smallest factors of the integer
		println("The factors for " + number + " is");
		int factor = 2;
		while (factor <= number) {
			if (number % factor == 0) {
				number = number / factor;
				println(factor);
			} else {
				factor++;
			}
		}

	}

	/**
	 * Write a program that prompts the user to enter the number of students and
	 * each student's name and score, and finally displays the name of the
	 * student with the highest score.
	 */

	public static void ex11() {
		// Prompt the user to enter the number of students
		print("Enter the number of students: ");
		int numOfStudents = readInt();

		print("Enter a student name: ");
		String student1 = readLine();
		print("Enter a student score: ");
		double score1 = readDouble();

		for (int i = 0; i < numOfStudents - 1; i++) {
			print("Enter a student name: ");
			String student = readLine();

			print("Enter a student score: ");
			double score = readDouble();

			if (score > score1) {
				student1 = student;
				score1 = score;
			}
		}

		println("Top student " + student1 + "'s score is " + score1);

	}

	/**
	 * Write a program that prompts the user to enter an integer from 1 to 15
	 * and displays a pyramid
	 */

	public static void ex12() {
		// Prompt the user to enter the number of lines
		print("Enter the number of lines: ");
		int numberOfLines = readInt();

		if (numberOfLines < 1 || numberOfLines > 15) {
			println("You must enter a number from 1 to 15");
			System.exit(1); //terminates the program
		}

		// Print lines
		for (int row = 1; row <= numberOfLines; row++) {
			// Print (NUMBER_OF_LINES - row) leading spaces
			for (int column = 1; column <= numberOfLines - row; column++)
				print("   ");

			// Print leading numbers row, row - 1, ..., 1
			for (int num = row; num >= 1; num--)
				print((num >= 10) ? " " + num : "  " + num);

			// Print ending numbers 2, 3, ..., row - 1, row
			for (int num = 2; num <= row; num++)
				print((num >= 10) ? " " + num : "  " + num);

			// Start a new line
			println("");
		}

	}

}