foo.cpp: In function 'int main()':
foo.cpp:34:55: error: lvalue required as left operand of assignment
   for (int i=0;i<n;i++) z=a[i].real()+.5,a[i+1].real()+=z/10,a[i].real()=z%10;
                                                       ^
foo.cpp:34:73: error: lvalue required as left operand of assignment
   for (int i=0;i<n;i++) z=a[i].real()+.5,a[i+1].real()+=z/10,a[i].real()=z%10;
                                                                         ^