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Update Armstrong Number (TheAlgorithms#2981)
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‎DIRECTORY.md

Lines changed: 40 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -8,6 +8,7 @@
88
* [IIRFilter](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/audiofilters/IIRFilter.java)
99
* backtracking
1010
* [Combination](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/Combination.java)
11+
* [FloodFill](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/FloodFill.java)
1112
* [KnightsTour](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/KnightsTour.java)
1213
* [NQueens](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/NQueens.java)
1314
* [Permutation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/Permutation.java)
@@ -93,7 +94,6 @@
9394
* [MergeSortedArrayList](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/MergeSortedArrayList.java)
9495
* [MergeSortedSinglyLinkedList](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/MergeSortedSinglyLinkedList.java)
9596
* [RandomNode](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/RandomNode.java)
96-
* [RemoveDuplicateNodes](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/RemoveDuplicateNodes.java)
9797
* [SearchSinglyLinkedListRecursion](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/SearchSinglyLinkedListRecursion.java)
9898
* [SinglyLinkedList](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/lists/SinglyLinkedList.java)
9999
* queues
@@ -108,15 +108,18 @@
108108
* [DecimalToAnyUsingStack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/DecimalToAnyUsingStack.java)
109109
* [DuplicateBrackets](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/DuplicateBrackets.java)
110110
* [InfixToPostfix](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/InfixToPostfix.java)
111+
* [LargestRectangle](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/LargestRectangle.java)
111112
* [MaximumMinimumWindow](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/MaximumMinimumWindow.java)
112113
* [NextGraterElement](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/NextGraterElement.java)
113114
* [NextSmallerElement](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/NextSmallerElement.java)
114115
* [NodeStack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/NodeStack.java)
116+
* [PostfixToInfix](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/PostfixToInfix.java)
115117
* [ReverseStack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/ReverseStack.java)
116118
* [StackArray](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/StackArray.java)
117119
* [StackArrayList](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/StackArrayList.java)
118120
* [StackOfLinkedList](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/stacks/StackOfLinkedList.java)
119121
* trees
122+
* [AVLSimple](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/trees/AVLSimple.java)
120123
* [AVLTree](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/trees/AVLTree.java)
121124
* [BinaryTree](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/trees/BinaryTree.java)
122125
* [BSTIterative](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/trees/BSTIterative.java)
@@ -160,12 +163,12 @@
160163
* [BruteForceKnapsack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/BruteForceKnapsack.java)
161164
* [CatalanNumber](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/CatalanNumber.java)
162165
* [CoinChange](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/CoinChange.java)
166+
* [CountFriendsPairing](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/CountFriendsPairing.java)
163167
* [DiceThrow](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/DiceThrow.java)
164168
* [DyanamicProgrammingKnapsack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/DyanamicProgrammingKnapsack.java)
165169
* [EditDistance](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/EditDistance.java)
166170
* [EggDropping](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/EggDropping.java)
167171
* [Fibonacci](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/Fibonacci.java)
168-
* [FloodFill](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/FloodFill.java)
169172
* [FordFulkerson](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/FordFulkerson.java)
170173
* [KadaneAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/KadaneAlgorithm.java)
171174
* [Knapsack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/Knapsack.java)
@@ -182,12 +185,14 @@
182185
* [MemoizationTechniqueKnapsack](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/MemoizationTechniqueKnapsack.java)
183186
* [MinimumPathSum](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/MinimumPathSum.java)
184187
* [MinimumSumPartition](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/MinimumSumPartition.java)
188+
* [NewManShanksPrime](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/NewManShanksPrime.java)
185189
* [PalindromicPartitioning](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/PalindromicPartitioning.java)
186190
* [RegexMatching](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/RegexMatching.java)
187191
* [RodCutting](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/RodCutting.java)
188192
* [ShortestCommonSupersequenceLength](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/ShortestCommonSupersequenceLength.java)
189193
* [SubsetSum](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/SubsetSum.java)
190194
* [Sum Of Subset](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/Sum_Of_Subset.java)
195+
* [UniquePaths](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/UniquePaths.java)
191196
* [WineProblem](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/dynamicprogramming/WineProblem.java)
192197
* maths
193198
* [AbsoluteMax](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/AbsoluteMax.java)
@@ -217,6 +222,7 @@
217222
* [FFTBluestein](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FFTBluestein.java)
218223
* [FibonacciJavaStreams](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FibonacciJavaStreams.java)
219224
* [FibonacciNumber](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FibonacciNumber.java)
225+
* [FindKthNumber](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FindKthNumber.java)
220226
* [FindMax](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FindMax.java)
221227
* [FindMaxRecursion](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FindMaxRecursion.java)
222228
* [FindMin](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/FindMin.java)
@@ -407,29 +413,35 @@
407413
* [Upper](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/Upper.java)
408414
* [WordLadder](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/WordLadder.java)
409415
* test
410-
* backtracking
411-
* [CombinationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/CombinationTest.java)
412-
* [FloodFillTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/FloodFillTest.java)
413-
* [PermutationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/PermutationTest.java)
414-
* maths
415-
* [FFTTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/FFTTest.java)
416-
* [GaussianTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/GaussianTest.java)
417-
* [KaprekarNumbersTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/KaprekarNumbersTest.java)
418-
* [PascalTriangleTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/PascalTriangleTest.java)
419-
* [PronicNumberTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/PronicNumberTest.java)
420-
* [SquareRootwithBabylonianMethodTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/SquareRootwithBabylonianMethodTest.java)
421-
* others
422-
* [ArrayLeftRotationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/ArrayLeftRotationTest.java)
423-
* [BestFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/BestFitCPUTest.java)
424-
* [FirstFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/FirstFitCPUTest.java)
425-
* [KadaneAlogrithmTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/KadaneAlogrithmTest.java)
426-
* [LinkList Sort test](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/LinkList_Sort_test.java)
427-
* [NewManShanksPrimeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/NewManShanksPrimeTest.java)
428-
* [NextFitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/NextFitTest.java)
429-
* [UniquePathsTests](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/UniquePathsTests.java)
430-
* [WorstFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/WorstFitCPUTest.java)
431-
* searches
432-
* [QuickSelectTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/searches/QuickSelectTest.java)
433-
* strings
434-
* [AlphabeticalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/AlphabeticalTest.java)
435-
* [PangramTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PangramTest.java)
416+
* backtracking
417+
* [CombinationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/CombinationTest.java)
418+
* [FloodFillTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/FloodFillTest.java)
419+
* [PermutationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/PermutationTest.java)
420+
* maths
421+
* [ArmstrongTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/ArmstrongTest.java)
422+
* [FFTTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/FFTTest.java)
423+
* [GaussianTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/GaussianTest.java)
424+
* [KaprekarNumbersTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/KaprekarNumbersTest.java)
425+
* [PascalTriangleTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/PascalTriangleTest.java)
426+
* [PronicNumberTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/PronicNumberTest.java)
427+
* [SquareRootwithBabylonianMethodTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/SquareRootwithBabylonianMethodTest.java)
428+
* others
429+
* [ArrayLeftRotationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/ArrayLeftRotationTest.java)
430+
* [BestFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/BestFitCPUTest.java)
431+
* [CountFriendsPairingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/CountFriendsPairingTest.java)
432+
* [FirstFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/FirstFitCPUTest.java)
433+
* [KadaneAlogrithmTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/KadaneAlogrithmTest.java)
434+
* [LinkList Sort test](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/LinkList_Sort_test.java)
435+
* [NewManShanksPrimeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/NewManShanksPrimeTest.java)
436+
* [NextFitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/NextFitTest.java)
437+
* [UniquePathsTests](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/UniquePathsTests.java)
438+
* [WorstFitCPUTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/WorstFitCPUTest.java)
439+
* searches
440+
* [QuickSelectTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/searches/QuickSelectTest.java)
441+
* strings
442+
* [AlphabeticalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/AlphabeticalTest.java)
443+
* [AnagramsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/AnagramsTest.java)
444+
* [CharacterSameTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CharacterSameTest.java)
445+
* [PalindromeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PalindromeTest.java)
446+
* [PangramTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PangramTest.java)
447+
* [UpperTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/UpperTest.java)

‎pom.xml

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@@ -7,10 +7,12 @@
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<artifactId>Java</artifactId>
88
<version>1.0-SNAPSHOT</version>
99
<packaging>jar</packaging>
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1011
<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>17</maven.compiler.source>
1314
<maven.compiler.target>17</maven.compiler.target>
15+
<assertj.version>3.22.0</assertj.version>
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</properties>
1517

1618
<dependencyManagement>
@@ -31,6 +33,11 @@
3133
<artifactId>junit-jupiter</artifactId>
3234
<scope>test</scope>
3335
</dependency>
36+
<dependency>
37+
<groupId>org.assertj</groupId>
38+
<artifactId>assertj-core</artifactId>
39+
<version>${assertj.version}</version>
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</dependency>
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</dependencies>
3542

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<build>

‎src/main/java/com/thealgorithms/maths/Armstrong.java

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@@ -4,43 +4,26 @@
44
* An Armstrong number is equal to the sum of the cubes of its digits. For
55
* example, 370 is an Armstrong number because 3*3*3 + 7*7*7 + 0*0*0 = 370. An
66
* Armstrong number is often called Narcissistic number.
7+
*
8+
* @author Vivek
79
*/
810
public class Armstrong {
911

10-
public static void main(String[] args) {
11-
assert (isArmStrong(0));
12-
assert (isArmStrong(1));
13-
assert (isArmStrong(153));
14-
assert (isArmStrong(1634));
15-
assert (isArmStrong(371));
16-
assert (!isArmStrong(200));
17-
}
18-
1912
/**
2013
* Checks whether a given number is an armstrong number or not.
2114
*
2215
* @param number number to check
2316
* @return {@code true} if given number is armstrong number, {@code false}
2417
* otherwise
2518
*/
26-
private static boolean isArmStrong(int number) {
27-
int sum = 0;
28-
int temp = number;
29-
int numberOfDigits = 0;
30-
while (temp != 0) {
31-
numberOfDigits++;
32-
temp /= 10;
33-
}
34-
temp = number;
35-
/* copy number again */
36-
while (number > 0) {
37-
int remainder = number % 10;
38-
int power = 1;
39-
for (int i = 1; i <= numberOfDigits; power *= remainder, ++i)
40-
;
41-
sum = sum + power;
42-
number /= 10;
19+
public boolean isArmstrong(int number) {
20+
long sum = 0;
21+
long number2 = number;
22+
while (number2 > 0) {
23+
long mod = number2 % 10;
24+
sum += Math.pow(mod, 3);
25+
number2 /= 10;
4326
}
44-
return sum == temp;
27+
return sum == number;
4528
}
46-
}
29+
}

‎src/test/java/com/thealgorithms/maths/ArmstrongTest.java

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Original file line numberDiff line numberDiff line change
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1+
package com.thealgorithms.maths;
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3+
import org.junit.jupiter.api.Test;
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5+
import static org.assertj.core.api.Assertions.assertThat;
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7+
/**
8+
* @author Vivek
9+
* @since 15/03/22
10+
*/
11+
class ArmstrongTest {
12+
13+
@Test
14+
void testIsArmstrong() {
15+
Armstrong armstrong = new Armstrong();
16+
assertThat(armstrong.isArmstrong(0)).isTrue();
17+
assertThat(armstrong.isArmstrong(1)).isTrue();
18+
assertThat(armstrong.isArmstrong(153)).isTrue();
19+
assertThat(armstrong.isArmstrong(371)).isTrue();
20+
assertThat(armstrong.isArmstrong(1634)).isFalse();
21+
assertThat(armstrong.isArmstrong(200)).isFalse();
22+
}
23+
}

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