DBL_MAX

[John]

Hi,

I know that to get the maximum floating point value we can use DBL_MAX.
To get the maximum negative value is it permissible (and portable) to
use (-DBL_MAX). If it is not, how does one get the maximum negative
representable value in a portable way?

Thanks,
John

 

[Victor Bazarov]

Hi,

I know that to get the maximum floating point value we can use DBL_MAX.
To get the maximum negative value is it permissible (and portable) to
use (-DBL_MAX). If it is not, how does one get the maximum negative
representable value in a portable way?

Using -DBL_MAX is permissible and portable.

You can also use '-std::numeric_limits<double>::max', which is a bit
convoluted way of getting essentially the same value, except if you need
to repackage your code in a template (parameterized on the FP type, for
example).

V

 

[red floyd]

Using -DBL_MAX is permissible and portable.

You can also use '-std::numeric_limits<double>::max', which is a bit
convoluted way of getting essentially the same value, except if you need
to repackage your code in a template (parameterized on the FP type, for
example).

Victor, isn't std::numeric_limits<T>::max a function?

e.g.:

std::numeric_limits<double>::max()

 

[John]

Using -DBL_MAX is permissible and portable.

You can also use '-std::numeric_limits<double>::max', which is a bit
convoluted way of getting essentially the same value, except if you need
to repackage your code in a template (parameterized on the FP type, for
example).

Thanks Victor.

John