Restrict user to input real number only in C++

Question

How can I restrict the user to input real numbers only in C++ program?

Example:

double number; cin >> number;

and it won\'t accept t

Answer 1

You cannot restrict what user types on the keyboard. You can accept it as std::string and use boost::lexical_cast to convert it to your expected number type and catch and process boost::bad_lexical_cast exception.