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POBigDecimal.pow() of negative number
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Id
9292044
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AcceptedAnswerId
9292110
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1
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0
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CreationDate
2012-02-15T10:57:40.523
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2012-02-15T11:22:06.807
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2012-02-15T11:22:06.807
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PostTypeId
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text
Body
I just cannot find the correct answer, so here is my problem: I want to be able to calculate the indexation (a positive or negative percentage) over a <code>price</code> and <code>period</code>. Expectations: <hr> Case #1 Price : 1.000,00 Indexation percentage : 5% Calculation over 5 years with positive percentage: <pre><code>1. 1000 x 5^0 = 1000 2. 1000 x 5^1 = 1050 3. 1000 x 5^2 = 1102,50 4. 1000 x 5^3 = 1157.625 5. 1000 x 5^4 = 1215,50625 </code></pre> Case #2 Price : 1.000,00 Indexation percentage : -5% Calculation over 5 years with negative percentage: <pre><code>1. 1000 x -5^0 = 1000 2. 1000 x -5^1 = 950 3. 1000 x -5^2 = 902,50 4. 1000 x -5^3 = 857,375 5. 1000 x -5^4 = 814,50625 </code></pre> Results: <hr> And this negative percentage goes wrong, because my java code prints this out: <pre><code>1000 -5000 -125000 15625000 1175690408 </code></pre> My code is pretty simple, i think: <pre><code>BigDecimal percentageValue = new BigDecimal("-5"); BigDecimal indexation = percentageValue.divide(ONE_HUNDRED).add(BigDecimal.ONE); BigDecimal price = new BigDecimal("1000"); for (int i = 0; i < 5; i++) { price = price.multiply(indexation.pow(i)); System.out.println(price.intValue()); } </code></pre> Solution: <pre><code>static final BigDecimal ONE_HUNDRED = new BigDecimal("100"); public static void main(String[] args) { BigDecimal percentageValue = new BigDecimal("-5"); BigDecimal indexation = percentageValue.divide(ONE_HUNDRED).add(BigDecimal.ONE); BigDecimal price = new BigDecimal("1000"); for (int i = 0; i < 5; i++) { BigDecimal result = price.multiply(indexation.pow(i)); System.out.println(result); } } </code></pre>
Tags
<java><bigdecimal><exponentiation>
Title
BigDecimal.pow() of negative number
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1. PO
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1. This table or related slice is empty.
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1. USadis
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