Field alignment

• left appends fill characters at the end.

• right inserts fill characters at the beginning.

      #include <iostream>
      #include <iomanip>
      using namespace std;
      int main () {
        cout << left << setfill( '?' ) << setw( 40 ) << "Hello";
        return 0;
      }
      /*
      Output:
      Hello???????????????????????????????????
      */