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NaN values are particularly problematic because they are unordered. That is, the expression NaN == NaN always returns false (see guideline FLP05NUM05-J. Do not attempt comparisons with NaN). In general, any comparisons with NaN return false, and all arithmetic functions with one or more NaN inputs produce NaN as their output. Consequently, a single occurrence of a NaN value can cause regressions within other code segments. This correctâ”and arguably desirableâ”behavior can cause unexpected results.
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\[[IEEE 754|https://www.securecoding.cert.org/confluence/display/seccode/AA.+C+References#AA.CReferences-IEEE7542006|IEEE 754]\] \[[IEEE 1003.1, 2004|https://www.securecoding.cert.org/confluence/display/seccode/AA.+C+References#AA.CReferences-IEEE1003|IEEE 1003.1, 2004]\] |
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FLP05NUM05-J. Do not attempt comparisons with NaN 03. Floating Point (FLP) FLP07-J. Do not use floating point variables as loop counters