C++ Tutorial/Language Basics/global namespace

Bring only a few names into the global namespace

<source lang="cpp">#include <iostream> // gain access to cout, cin, and hex using std::cout; using std::cin; using std::hex; int main() {

 int val;
 cout << "Enter a number: ";
 cin >> val;
 cout << "This is your number: ";
 cout << hex << val; 
 return 0;

}</source>

Enter a number: 1
This is your number: 1

Use explicit std:: qualification

<source lang="cpp">#include <iostream> int main() {

 int val;
 std::cout << "Enter a number: ";
 std::cin >> val;
 std::cout << "This is your number: ";
 std::cout << std::hex << val;
 return 0;

}</source>

Enter a number: 1
This is your number: 1