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Because 0.1f is rounded to the nearest value that can be represented in the value set of the float type, the actual quantity added to x on each iteration is somewhat larger than 0.1. Consequently, the loop executes only nine times and typically fails to produce the expected output.
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This noncompliant code example uses a floating-point loop counter that is incremented by an amount that is typically too small to change its value given the precision.
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This compliant solution uses an integer loop counter from which the floating-point value is derived. Additionally, it uses a double to ensure that the available precision suffices to represent the desired values. The solution also runs in FP-strict mode to guarantee portability of its results. See NUM06-J for more information.
| Code Block | ||
|---|---|---|
| ||
for (int count = 1; count <= 10; count += 1) {
double x = 100000000.0 + count;
/* ... */
}
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FLP30-C. Do not use floating point variables as loop counters | ||||
FLP30-CPP. Do not use floating point variables as loop counters | ||||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="553d9ad7626c3beb-87cbf9fb-427345b3-ab8fa952-280f2186d2275bc5abea53f3"><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="5503b272a71a7292-d0866301-462544db-8556beeb-4d8028f9797d25b1d3e89e90"><ac:plain-text-body><![CDATA[ | [[Bloch 2005 | AA. Bibliography#Bloch 05]] | Puzzle 34, Down for the count | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="d4e5e1a6d1ed75cc-2e4b1b9b-4c504748-933fb447-131de01b0e472f68e1f0eca7"><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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