Is there any way to set up Visual Studio (just upgraded from 2008 to 2010) to break, as if an assertion failed, whenever any floating point number becomes NaN, QNAN, INF, etc?
Up until now I have just been using the assert(x == x) trick, but I would rather something implicit, so that I dont have to add assertions everywhere.
Quite surprised I can't find an answer to this via google. Some stuff about 'floating point exceptions', but I'm not sure if they are the same thing, and I've tried enabling them in Visual Studio, but the program doesn't break until something catastrophic happens because of the NaN later on in execution.
To check whether a floating point or double number is NaN (Not a Number) in C++, we can use the isnan() function. The isnan() function is present into the cmath library. This function is introduced in C++ version 11.
NaN stands for Not A Number and is one of the common ways to represent the missing value in the data. It is a special floating-point value and cannot be converted to any other type than float. NaN value is one of the major problems in Data Analysis.
An expression representing positive infinity. It is equal to the value produced by mathematical operations like 1.0 / 0.0 .
CPP. Another way to check for NaN is by using “isnan()” function, this function returns true if a number is complex else it returns false. This C library function is present in <cmath> header file.
1) Go to project option and enable /fp:strict (C/C++ -> Code Generation -> Floating Pint Model).
2) Use _controlfp to set the floating-point control word (see code below).
#include <float.h> unsigned int fp_control_state = _controlfp(_EM_INEXACT, _MCW_EM); #include <math.h> int main () { sqrtf(-1.0); // floating point exception double x = 0.0; double y = 1.0/x; // floating point exception return 0; }
Try enabling fp exceptions
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