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62 lines
2.4 KiB
Java
62 lines
2.4 KiB
Java
//ProjectEuler/Java/Problem6.java
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//Matthew Ellison
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// Created: 03-01-19
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//Modified: 03-28-19
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//Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
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//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/JavaClasses
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/*
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Copyright (C) 2019 Matthew Ellison
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import mattrixwv.Stopwatch;
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public class Problem6{
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private static final Integer START_NUM = 1; //The first number that needs to be counted
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private static final Integer END_NUM = 100; //The last number that needs to be counted
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public static void main(String[] argv){
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Stopwatch timer = new Stopwatch(); //SO you can time the algorithm's run time
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//Start the timer
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timer.start();
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//Setup the variables
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Long sumOfSquares = 0L; //Holds the sum of the squares of all the numbers
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Long squareOfSum = 0L; //Holds the square of the sum of all the numbers
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//Run through all numbers and add them to the appropriate sums
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for(Integer currentNum = START_NUM;currentNum <= END_NUM;++currentNum){
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sumOfSquares += (currentNum * currentNum); //Add the square to the correct variable
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squareOfSum += currentNum; //Add the number to the correct variable to squaring later
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}
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//Squaring the sum that needs it
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squareOfSum *= squareOfSum;
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//Stop the timer
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timer.stop();
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//Print the results
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System.out.printf("The difference between the sum of the squares and the square of the sum of all numbers from 1-100 is %d\n", Math.abs(sumOfSquares - squareOfSum));
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System.out.println("It took " + timer.getStr() + " to run this algorithm");
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}
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}
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/* Results:
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The difference between the sum of the squares and the square of the sum of all numbers from 1-100 is 25164150
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It took 466.115 microseconds to run this algorithm
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*/
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