#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

int main()
{ while (true)
  { string s;
    char * after = { 0 };
    cout << "> ";
    cin >> s;
    double d = strtod(s.c_str(), & after);
    cout << "d = " << d << ", after = \"" << after << "\"\n";
    if (after[0] == 0)
      cout << "valid\n";
    else
      cout << "bad\n"; } }