$ ./main
 pi   :   3.141593 is_nan: F is_inf: F
 nan8_:        NaN is_nan: T is_inf: F

 nan4 :        NaN is_nan: T is_inf: F
 nan8 :        NaN is_nan: T is_inf: F
 pinf4:   Infinity is_nan: F is_inf: T
 ninf4:  -Infinity is_nan: F is_inf: T
 pinf8:   Infinity is_nan: F is_inf: T
 ninf8:  -Infinity is_nan: F is_inf: T