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Asked: 2026-05-16T18:36:51+00:00

I am going to do some math calculations using C++ . The input floating

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I am going to do some math calculations using C++ . The input floating point number is a valid number, but after the calculations, the resulting value is NaN. I would like to trace the point where NaN value appears (possibly using GDB), instead of inserting a lot of isNan() into the code. But I found that even code like this will not trigger an exception when a NaN value appears.

double dirty = 0.0;
double nanvalue = 0.0/dirty;

Could anyone suggest a method for tracing the NaN or turning a NaN into an exception?

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1 Answer

  1. Editorial Team

    In Visual Studio you can use the _controlfp function to set the behavior of floating-point calculations (see http://msdn.microsoft.com/en-us/library/e9b52ceh(VS.80).aspx). Maybe there is a similar variant for your platform.

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