Why? I know semi-column. But, it is not necessary.
If you do not want echo you put a semi-column. If you want it echo no semi-column.
That is the rule I learnt.
My statements are not interpreted as multiplying. Suppose MATHEMATICA interpreted it as multiplying I won't get those two correct echos, i.e. A is not assigned but echoed, while B is assigned.
Is there anyway to debug my program? To see how does Mathematica interpret my statement? Perhaps, a FullForm?