View Compilation Error

0_0_36157864_7959.cpp: In function 'int main()':
0_0_36157864_7959.cpp:47:8: error: 'cin' was not declared in this scope
  while(cin>>n)
        ^
0_0_36157864_7959.cpp:70:10: error: expected '}' at end of input
  return 0;
          ^