using namespace std;
#include <iostream>

int main ()        
{

   cout << "12 significa: " << 12 << endl;
   cout << "012 significa: " << 012 << endl;
   cout << "0X12 significa: " << 0X12 << endl;

   cout << "-12.451e3 significa: " << -12.451e3 << endl;
   cout << "-12.451e-3 significa: " << -12.451e-3 << endl;

return 0;
}