View Compilation Error

0_0_16776902_3771.cpp: In function 'int main()':
0_0_16776902_3771.cpp:4:8: error: 'cin' was not declared in this scope
  while(cin>>n>>m,m)
        ^
0_0_16776902_3771.cpp:4:13: error: 'n' was not declared in this scope
  while(cin>>n>>m,m)
             ^
0_0_16776902_3771.cpp:4:16: error: 'm' was not declared in this scope
  while(cin>>n>>m,m)
                ^
0_0_16776902_3771.cpp:11:10: error: 'map' was not declared in this scope
     cin>>map[i][j];
          ^
0_0_16776902_3771.cpp:18:8: error: 'map' was not declared in this scope
     if(map[i][j]=='@')
        ^
0_0_16776902_3771.cpp:22:13: error: 'BFS' was not declared in this scope
      BFS(i,j);
             ^
0_0_16776902_3771.cpp:26:3: error: 'cout' was not declared in this scope
   cout<<sum<<endl;
   ^
0_0_16776902_3771.cpp:26:14: error: 'endl' was not declared in this scope
   cout<<sum<<endl;
              ^