View Compilation Error

0_0_38271435_23587.cpp: In function 'int main()':
0_0_38271435_23587.cpp:49:9: error: 'cin' was not declared in this scope
  while (cin >> a >> b >> c)
         ^
0_0_38271435_23587.cpp:58:4: error: 'cout' was not declared in this scope
    cout << "w(" << a << ", " << b << ", " << c << ") = " 
    ^
0_0_38271435_23587.cpp:59:12: error: 'endl' was not declared in this scope
    << 1 << endl;
            ^
0_0_38271435_23587.cpp:64:4: error: 'cout' was not declared in this scope
    cout << "w(" << a << ", " << b << ", " << c << ") = " 
    ^
0_0_38271435_23587.cpp:65:24: error: 'endl' was not declared in this scope
    << f[20][20][20] << endl;
                        ^
0_0_38271435_23587.cpp:68:3: error: 'cout' was not declared in this scope
   cout << "w(" << a << ", " << b << ", " << c << ") = "
   ^
0_0_38271435_23587.cpp:69:21: error: 'endl' was not declared in this scope
    << f[a][b][c] << endl;
                     ^