Checking not a number value

[ajlahmed]

Hi
I have a variable X, this variable sometimes returns not a number (nan). I want to check this variable if it is a not number or a number and make this variable equal to zero if it is not a number (nan). Anyone can help me plz..
Regards

[Peter87]

You can use std::isnan.

http://en.cppreference.com/w/cpp/numeric/math/isnan

[ajlahmed]

As I am beginner, can u plz check this code:
if (isnan( double X ))
{
X=0;
}

[Peter87]

if (std::isnan(X))
{
	X = 0;
}

Don't forget to include <cmath>.

[ajlahmed]

Okay.
Thanks it is working now.