foo.cpp: In function 'int main()':
foo.cpp:35:42: error: lvalue required as left operand of assignment
   rep(i,n) z=a[i].real()+.5,a[i+1].real()+=z/10,a[i].real()=z%10;
                                          ^
foo.cpp:35:60: error: lvalue required as left operand of assignment
   rep(i,n) z=a[i].real()+.5,a[i+1].real()+=z/10,a[i].real()=z%10;
                                                            ^