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Returning a NaN

Started by Auron Jan 19, 2005 at 10:24 PM 1 replies 700+ views

Original Post

Jan 19, 2005 at 10:24 PM

I'm programming some general purpose 2D math stuff and I have a Line class. One of the methods in that class returns the slope of the line. If a line is vertical, it will have a slope of infinity. Is there any reliable way to return a NaN or Inf value from a function without the possibility of raising an exception or other run-time error? Since I've heard that generating a NaN/Inf is very implementation specific, you'll probably want to know I'm presently coding in Visual C++ Express but I will soon have to port the code to GCC for Linux. -Auron

XXX_Andrew_XXX

Jan 19, 2005 at 10:48 PM

Use the STL to get a platform independant value

#include <limits>#include <iostream>using std::cout;using std::endl;int main(){    cout << std::numeric_limits<double>::infinity() << endl;    cout << std::numeric_limits<double>::signaling_NaN() << endl;}

Auron

Jan 20, 2005 at 2:16 AM

Thanks muchly! That's what I was looking for.

-Auron

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