The ends of the dipole are q+ and q-. Positive end and negative end.
positive end with q+ charge , the charge is +1.6 x 10^-19 C
negative end with q- charge, the chrage is -1.6 x 10^-19 C.
The magnitude of the charge develeoped at the ends of dipole will be without sign, that is 1.6 x 10^-19 C.