20. Line-based Input, std::getline

• 
      #include <iostream>
      #include <string>
      using namespace std;
  
      int main()
      {
          string text_line;
  
          // Line-based input of text:
          cout << "Type something: ";
          getline( cin, text_line );
  
          cout << "You typed: ";
          cout << text_line;
          cout << '\n';
  
          return 0;
      }