what is a domain error

Question

in c++, has a base class for \'domain errors\', std::domain_error. i don\'t understand under what circumstances i should throw a domain error in my code. all

Answer 1

It refers to mathematical domains.

float MySqrRoot(float x)
{
    // sqrt is not valid for negative numbers.
    if (x < 0) throw new domain_error;

    //...
}