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Floating-point numbers can take on two classes of exceptional values; infinity and NaN (not-a-number). These values are returned as the result of exceptional or otherwise unresolvable floating point operations. (See also: \[<span style="color: #003366"><span style="text-decoration: underline; ">FLP32-C. Prevent or detect domain and range errors in math functions |#</span></span> [https://www.securecoding.cert.org/confluence/display/seccode/FLP32-C.+Prevent+or+detect+domain+and+range+errors+in+math+functions]\]). Additionally, they can be directly input by a user by scanf or similar functions. Failure to detect and handle such values can result in undefined behavior. |
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