Rewrite the following so that it doesn’t use using declarations or using directives:

#include
using namespace std;
int main()
{
double x;
cout << "Enter value: ";
while (! (cin >> x) )
{
cout << "Bad input. Please enter a number: ";
cin.clear();
while (cin.get() != '\n')
continue;

}
cout << "Value = " << x << endl;
return 0;
}