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package Exercises;
import java.util.Scanner;
public class CountVowels {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		String text;
		System.out.println("Enter text: ");
		text = s.nextLine();
		char[] textArray = text.toCharArray();
		int vowelCount = 0;
		for(char c : textArray) {
			String newChar = String.valueOf(c);
			if(newChar.equalsIgnoreCase("o") || newChar.equalsIgnoreCase("i")
					|| newChar.equalsIgnoreCase("o") || newChar.equalsIgnoreCase("u")) {
				vowelCount++;
			}
		}
		System.out.println("The number of vowels in \"" + text + "\" is " + vowelCount);
		s.close();
	}

}




package Exercises;
import java.util.Random;
public class DiceRolls {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Random r = new Random();
		System.out.format("%-5s %4s %6s", "Dice 1", "Dice 2", "Total");
		for(int i = 1; i < 5; i++) {
			int d1 = r.nextInt(6) +1;
			int d2 = r.nextInt(6) +1;
			System.out.format("%3s %6s %8s", "\n" + d1, d2, (d1 + d2));
		}
	}

}





package Exercises;

import java.util.Scanner;

public class DigitsDisplay {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		int number;
		System.out.println("Enter a positive integer");
		number = s.nextInt();
		if(number >= 0) {
			for(int i = 0; i < String.valueOf(number).length(); i++) {
				System.out.println(String.valueOf(number).charAt(i));
			}
		} else {
			System.err.println("The integer must be positive.");

		}
		s.close();
	}

}





package Exercises;
import java.util.Scanner;
public class DigitsSum {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		int number;
		int sum = 0;
		System.out.println("Enter a positive integer: ");
		number = s.nextInt();
		if(number >+ 0) {
			for(int i = 0; i < String.valueOf(number).length(); i++) {
				char n = String.valueOf(number).charAt(i);
				sum += Integer.valueOf(String.valueOf(n));
			}
			System.out.println("The sum of the digits is: " + sum);
		} else {
			System.err.println("The integer must be positive.");
		}
		s.close();
	}

}


package Exercises;
import java.util.Scanner;
public class ElapsedTimeCalculator {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		int startingHour, elapsedHours;
		String timeOfDay;
		System.out.println("Enter the starting hour: ");
		startingHour = s.nextInt();
		System.out.println("Enter AM or PM: ");
		timeOfDay = s.next().toUpperCase();
		System.out.println("Enter the number of elapsed hours: ");
		elapsedHours = s.nextInt();

		int newTime = convertTo24Hour(startingHour, timeOfDay);
		newTime =+ elapsedHours;
		if(newTime < 12) {
			System.out.println("the time is: " + newTime + ":00 AM");
		} else {
			int d = newTime / 12;
			int d1 = newTime % 12;
			if(Math.floor(Double.valueOf(d) / 2.0) == (Double.valueOf(d)) / 2.0) {
				System.out.println("The time is: " + d1 + "00 PM");
			} else {
				System.out.println("The time is: " + d1 + "00 AM");
			}

		}
		s.close();
	}

	public static int convertTo24Hour(int time, String timeOfDay) {
		if(timeOfDay == "PM") {
			return 12 + time;
		} else {
			return time;
		}
	}

}


package Exercises;
import java.util.Random;
import java.util.Scanner;
public class GuessingGame {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		Random r = new Random();
		int n1 , n2;
		n1 = r.nextInt(20) + 1;
		System.out.println("Enter a number between 1 and 20:");
		n2 = s.nextInt();
		if(n2 < 1 || n2 > 20) {
			System.err.println("Number must be between 1 and 20.");
		} else {
			System.out.println("Computer's Number:" + n1);
			if(n1 == n2) {
				System.out.println("You got the number!");
			} else {
				System.out.println("Better luck next time.");
			}
		}
		s.close();
	}

}



package Exercises;
import java.util.Scanner;
public class Monogram {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		String first, middle, last;
		System.out.println("Enter your first name:");
		first = s.next();
		System.out.println("Enter your middle initial:");
		middle = s.next();
		System.out.println("Enter your last name:");
		last = s.next();
		System.out.println("\nYour monogram is: " + String.valueOf(first.charAt(0)) .toLowerCase() +
				middle.toUpperCase() +
				String.valueOf(last.charAt(0)).toLowerCase());
		s.close();
	}

}



package Exercises;
import java.util.Scanner;
public class RemoveString {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		String text, replace;
		System.out.println("Enter a sentence:");
		text = s.nextLine();
		System.out.println("Enter a string:");
		replace = s.next();
		System.out.println(text.replaceAll(" " + replace, ""));
		s.close();

	}

}