Possible Duplicate:
Checking if a double (or float) isnan
in C++
I have a requirement to check if float is NaN
. By going through some of the links I found the most common check.
FLOAT32 f32_test_NaN = (some_value);
if (f32_test_NaN == f32_test_NaN)
{
//do something;
}
else
{
// do something;
}
But this does not seem to work for me. My code is as follows:
FLOAT32 test_NaN = 0x414570A3;//some value - is this ok?
Debugging on GDB:
(gdb) p test_NaN
$1 = 1.09506982e+09
(gdb) p/x test_NaN
$2 = 0x41457080 // Hex is not same as init value - What is compiler doing?
So in my case test_NaN
is equal to test_NaN
.
Please let me know if any compiler setting has to be done. I am running on solaris. Or is there any other way to check the same.
Thanks in advance.
Include math.h
and use int isnan(x)
. Don't forget to link with -lm