Caught Error Floating Point Exception Signal 8
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us floating point exception error in c Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow floating point exception error in fluent Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Dealing floating point exception handling c++ with Floating Point exceptions up vote 9 down vote favorite 5 I am not sure how to deal with floating point exceptions in either C or C++. From wiki, there are following types of floating point exceptions: IEEE 754 specifies five arithmetic
C++ Catch Floating Point Exception
errors that are to be recorded in "sticky bits" (by default; note that trapping and other alternatives are optional and, if provided, non-default). * inexact, set if the rounded (and returned) value is different from the mathematically exact result of the operation. * underflow, set if the rounded value is tiny (as specified in IEEE 754) and inexact (or maybe limited to if it has denormalisation loss, as per the 1984 version of IEEE 754), returning a subnormal value (including the zeroes). * overflow, set feenableexcept if the absolute value of the rounded value is too large to be represented (an infinity or maximal finite value is returned, depending on which rounding is used). * divide-by-zero, set if the result is infinite given finite operands (returning an infinity, either +∞ or −∞). * invalid, set if a real-valued result cannot be returned (like for sqrt(−1), or 0/0), returning a quiet NaN. Is it that when any type of above exceptions happens, the program will exit abnormally? Or the program will carry this error on without mentioning anything and therefore make the error hard to debug? Is a compiler like gcc able to give warning for some obvious case? What can I do during coding my program to notify where the error happens and what types it is when it happens, so that I can locate the error easily in my code? Please give solutions in both C and C++ case. Thanks and regards! c++ c exception floating-point signals share|improve this question asked Feb 8 '10 at 2:24 Tim 18.9k76177276 answers will likely be specific to an Operating System. Do you have one in mind? –John Knoeller Feb 8 '10 at 2:36 Both linux and windows, although I am now using Linux more often. –Tim Feb 8 '10 at 2:54 add a comment| 6 Answers 6 active oldest votes up vote 6 down vote accepted On Linux you can use the GNU extension feenableexcept (hidden right at the bottom of that page) to turn on
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Floating Point Exceptions
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compilers and the Solaris operating environment on SPARC and x86 platforms supports all of the exception handling facilities required by the IEEE standard as well as many of the recommended optional facilities. One objective of these facilities is explained in the IEEE 854 Standard (IEEE 854, page 18): ... to minimize for users the complications arising from exceptional conditions. The arithmetic system is intended to continue to function on a computation as long as possible, handling unusual situations with reasonable default responses, including setting appropriate flags. To achieve this objective, the standards specify default results for exceptional operations and require that an implementation provide status flags, which can be sensed, set, or cleared by a user, to indicate that exceptions have occurred. The standards also recommend that an implementation provide a means for a program to trap (i.e., interrupt normal control flow) when an exception occurs. The program can optionally supply a trap handler that handles the exception in an appropriate manner, for example by providing an alternate result for the exceptional operation and resuming execution. This chapter lists the exceptions defined by IEEE 754 along with their default results and describes the features of the floating point environment that support status flags, trapping, and exception handling. What Is an Exception? It is hard to define exceptions. To quote W. Kahan, An arithmetic exception arises when an attempted atomic arithmetic operation has no result that would be acceptable universally. The meanings of atomic and acceptable vary with time and place. (See Handling Arithmetic Exceptions by W. Kahan.) For example, an exception arises when a program attempts to take the square root of a negative number. (This example is one case of an invalid operation exception.) When such an exception occurs, the system responds in one of two ways: If the exception's trap is disabled (the default case), the system records the fact that the exception occurred and continues executing the program using the default result specified by IEEE 754 for the excepting operation. If the exception's trap is enabled, the system generates a SIGFPE signal. If the program has installed a SIGFPE signal handler, the system transf