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When precise computation is necessary, such as when performing currency calculations, then floating-point types must not be used. Instead, use an alternative representation that can completely represent the necessary values.
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Because the value 0.10 lacks an exact representation in either Java floating-point type (or any floating-point format that uses a binary mantissa), on most platforms, this program prints:
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A dollar less 7 dimes is $0.29999999999999993 |
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FLP02-C. Avoid using floating point numbers when precise computation is needed | ||||
FLP02-CPP. Avoid using floating point numbers when precise computation is needed | ||||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b47a357bd6267435-266aa04b-48d9438e-89c28af7-c0e1dd72ebbed80cf1081bf5"><ac:plain-text-body><![CDATA[ | [ISO/IEC TR 24772:2010 | http://www.aitcnet.org/isai/] | Floating-Point Arithmetic [PLF] | ]]></ac:plain-text-body></ac:structured-macro> |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="e1f06396002d0b51-7b8c3674-4a0c4d8b-96eebf23-4ea1ebe328d99179e3674799"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 48, Avoid | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="85d4a2613780ed91-68239919-47b345b8-9833912f-d8598d91eca2bcfe4e3923b0"><ac:plain-text-body><![CDATA[ | [[Bloch 2005 | AA. Bibliography#Bloch 05]] | Puzzle 2, Time for a change | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="43fc7129715d7f3e-7bc2cd44-4bb641eb-a57aaba1-059964bd4694c5a30bcfd616"><ac:plain-text-body><![CDATA[ | [[Goldberg 1991 | AA. Bibliography#Goldberg 91]] |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="3b96aeeb1f58183f-b7596a9c-4be14c41-88398250-755e75def61f0bf5078c00b1"><ac:plain-text-body><![CDATA[ | [[IEEE 754 | AA. Bibliography#IEEE 754 2006]] |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="aa1974a0c3af9d39-ebe19696-4ecb42c3-b014bd9a-4787ec8e5d3c30db4919546e"><ac:plain-text-body><![CDATA[ | [[JLS 2005 | AA. Bibliography#JLS 05]] | [§4.2.3, Floating-Point Types, Formats, and Values | http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3] | ]]></ac:plain-text-body></ac:structured-macro> |
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