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Add tests for SumOfArithmeticSeries (#4256)

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This commit is contained in:
Piotr Idzik
2023-07-24 18:25:40 +02:00
committed by GitHub
parent e897a93166
commit 06ef351987
2 changed files with 59 additions and 17 deletions
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23
src/main/java/com/thealgorithms/maths/SumOfArithmeticSeries.java
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@ -10,22 +10,8 @@ package com.thealgorithms.maths;
* <p>
* Wikipedia: https://en.wikipedia.org/wiki/Arithmetic_progression
*/
public class SumOfArithmeticSeries {
public static void main(String[] args) {
/* 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 */
assert Double.compare(55.0, sumOfSeries(1, 1, 10)) == 0;
/* 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 */
assert Double.compare(100.0, sumOfSeries(1, 2, 10)) == 0;
/* 1 + 11 + 21 + 31 + 41 + 51 + 61 + 71 + 81 + 91 */
assert Double.compare(460.0, sumOfSeries(1, 10, 10)) == 0;
/* 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 0.6 + 0.7 + 0.8 + 0.9 + 1.0 */
assert Double.compare(5.5, sumOfSeries(0.1, 0.1, 10)) == 0;
assert Double.compare(49600.0, sumOfSeries(1, 10, 100)) == 0;
public final class SumOfArithmeticSeries {
private SumOfArithmeticSeries() {
}
/**
@ -36,7 +22,10 @@ public class SumOfArithmeticSeries {
* @param numOfTerms the total terms of an arithmetic series
* @return sum of given arithmetic series
*/
private static double sumOfSeries(double firstTerm, double commonDiff, int numOfTerms) {
public static double sumOfSeries(final double firstTerm, final double commonDiff, final int numOfTerms) {
if (numOfTerms < 0) {
throw new IllegalArgumentException("numOfTerms nonnegative.");
}
return (numOfTerms / 2.0 * (2 * firstTerm + (numOfTerms - 1) * commonDiff));
}
}