View Compilation Error

0_0_19667894_23142.cpp: In function 'void FFT(Complex*, int, int)':
0_0_19667894_23142.cpp:41:54: error: lvalue required as left operand of assignment
  if(op == -1) for(int i = 0; i < n; i++) P[i].real() /= n;
                                                      ^