ProjectEulerJava/Problem17.java

//ProjectEuler/Java/Problem16.java
//Matthew Ellison
// Created: 03-04-19
//Modified: 03-28-19
//If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?
//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/JavaClasses
/*
	Copyright (C) 2019  Matthew Ellison

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/


import mattrixwv.Stopwatch;


public class Problem17{
	private static final Integer START_NUM = 1;
	private static final Integer STOP_NUM = 1000;
	public static void main(String[] argv){
		Stopwatch timer = new Stopwatch();	//To time the algorithm's run time
		//Setup the variables needed
		Integer sumOfLetters = 0;

		//Start the timer
		timer.start();

		//Start with 1 and increment
		for(Integer num = START_NUM;num <= STOP_NUM;++num){
			//Pass the number to a function that will create a string for the number
			String currentNumString = getStringFromNum(num);
			//Pass the string to ta function that will count the number of letters in it, ignoring whitespace and punctuation and add that number to the running tally
			sumOfLetters += getNumberChars(currentNumString);
		}

		//Stop the timer
		timer.stop();

		//Print the results
		System.out.printf("The sum of all the letters in all the numbers %d-%d is %d\n", START_NUM, STOP_NUM, sumOfLetters);
		System.out.println("It took " + timer.getStr() + " to run this algorithm");
	}
	private static String getStringFromNum(Integer number){
		String numberString = new String();
		//Starting with the largest digit create a string based on teh number passed in
		//Check for negative
		if(number < 0){
			numberString = numberString.concat("negative ");
		}

		//Check if teh number is zero
		if(number == 0){
			numberString = numberString.concat("zero");
		}

		//Start with the thousands place
		if((number.doubleValue() / 1000D) >= 1D){
			numberString = numberString.concat(getStringFromNum((int)Math.floor(number / 1000D)));
			numberString = numberString.concat(" thousand");
			number -= ((int)Math.floor(number.doubleValue() / 1000D)) * 1000;
		}

		//Check the hundreds place
		if((number.doubleValue() / 100D) >= 1D){
			numberString = numberString.concat(getStringFromNum((int)Math.floor(number.doubleValue() / 100D)));
			numberString = numberString.concat(" hundred");
			number -= ((int)Math.floor(number.doubleValue() / 100D)) * 100;
		}

		//Insert an and if there is need
		if((!numberString.isBlank() && (number > 0))){
			numberString = numberString.concat(" and ");
		}

		//Check for tens place
		if((number.doubleValue() / 10D) >= 2D){
			//FOr the tens you need to do something special
			Integer tensPlace = (int)Math.floor(number.doubleValue() / 10D);
			if(tensPlace == 9){
				numberString = numberString.concat("ninety");
			}
			else if(tensPlace == 8){
				numberString = numberString.concat("eighty");
			}
			else if(tensPlace == 7){
				numberString = numberString.concat("seventy");
			}
			else if(tensPlace == 6){
				numberString = numberString.concat("sixty");
			}
			else if(tensPlace == 5){
				numberString = numberString.concat("fifty");
			}
			else if(tensPlace == 4){
				numberString = numberString.concat("forty");
			}
			else if(tensPlace == 3){
				numberString = numberString.concat("thirty");
			}
			else if(tensPlace == 2){
				numberString = numberString.concat("twenty");
			}
			number -= (tensPlace * 10);
			//If there is something left in the number you will need a dash to separate the tens and ones place
			if(number > 0){
				numberString = 	numberString.concat("-");
			}
		}
		//Check for teens
		else if((number.doubleValue() / 10D) >= 1D){
			Integer onesPlace = (number % 10);
			if(onesPlace == 9){
				numberString = numberString.concat("nineteen");
			}
			else if(onesPlace == 8){
				numberString = numberString.concat("eighteen");
			}
			else if(onesPlace == 7){
				numberString = numberString.concat("seventeen");
			}
			else if(onesPlace == 6){
				numberString = 	numberString.concat("sixteen");
			}
			else if(onesPlace == 5){
				numberString = numberString.concat("fifteen");
			}
			else if(onesPlace == 4){
				numberString = numberString.concat("fourteen");
			}
			else if(onesPlace == 3){
				numberString = numberString.concat("thirteen");
			}
			else if(onesPlace == 2){
				numberString = numberString.concat("twelve");
			}
			else if(onesPlace == 1){
				numberString = numberString.concat("eleven");
			}
			else if(onesPlace == 0){
				numberString = numberString.concat("ten");
			}
			//If this was hit the number was completed
			number = 0;
		}

		//Check for the ones place
		if(number >= 1){
			if(number == 9){
				numberString = numberString.concat("nine");
			}
			else if(number == 8){
				numberString = numberString.concat("eight");
			}
			else if(number == 7){
				numberString = numberString.concat("seven");
			}
			else if(number == 6){
				numberString = numberString.concat("six");
			}
			else if(number == 5){
				numberString = 	numberString.concat("five");
			}
			else if(number == 4){
				numberString = 	numberString.concat("four");
			}
			else if(number == 3){
				numberString = numberString.concat("three");
			}
			else if(number == 2){
				numberString = numberString.concat("two");
			}
			else if(number == 1){
				numberString = numberString.concat("one");
			}
			//If this was hit the number was completed
			number = 0;
		}

		//Return the string
		return numberString;
	}
	private static Integer getNumberChars(String number){
		Integer sumOfLetters = 0;
		//Start at location 0 and count the number of letters, ignoring punctuation and whitespace
		for(Integer location = 0;location < number.length();++location){
			if(Character.isAlphabetic(number.charAt(location))){
				sumOfLetters += 1;
			}
		}

		//Return the number of letters
		return sumOfLetters;
	}
}

/* Results:
The sum of all the letters in all the numbers 1-1000 is 21124
It took 4.862 milliseconds to run this algorithm
*/