Question

how to check robinson no. in c++​

Answer 1

Answer:

I know the answer of the question but you first marks as brainlist

Answer 2

Answer:

bool is_number(const std::string& s)

{

std::string::const_iterator it = s.begin();

while (it != s.end() && std::isdigit(*it)) ++it;

return !s.empty() && it == s.end();

}