View Compilation Error

0_0_38318102_31729.cpp: In function 'void fun()':
0_0_38318102_31729.cpp:41:2: error: 'cin' was not declared in this scope
  cin >> a[0] >> a[1] >> a[2] >> a[3];
  ^
0_0_38318102_31729.cpp:77:11: error: 'shuchu' was not declared in this scope
   shuchu(a);
           ^
0_0_38318102_31729.cpp:82:5: error: 'cout' was not declared in this scope
     cout << " ";
     ^
0_0_38318102_31729.cpp:88:5: error: 'cout' was not declared in this scope
     cout << endl;
     ^
0_0_38318102_31729.cpp:88:13: error: 'endl' was not declared in this scope
     cout << endl;
             ^
0_0_38318102_31729.cpp:93:4: error: 'cout' was not declared in this scope
    cout << endl << endl;
    ^
0_0_38318102_31729.cpp:93:12: error: 'endl' was not declared in this scope
    cout << endl << endl;
            ^