View Compilation Error

0_0_24394288_11281.cpp: In function 'int main()':
0_0_24394288_11281.cpp:11:11: error: 'cin' was not declared in this scope
     while(cin>>N,N!=0)
           ^
0_0_24394288_11281.cpp:31:10: error: 'cout' was not declared in this scope
          cout<<time<<endl;
          ^
0_0_24394288_11281.cpp:31:22: error: 'endl' was not declared in this scope
          cout<<time<<endl;
                      ^