Oops
But this doesn't compile well either:
// If as a result of the attempt to move, the robot is at an energy
// source, it's recharged to the FULL_ENERGY level.
if (energySourceAt(m_row, m_col))
m_energy = FULL_ENERGY;
error C3861: 'energySourceAt': identifier not found
This is under the Robot:step()