`P`

and `Q`

point to distinct locations
that happen to contain identical values:
If we change one of them, the other is unaffected, e.g.

`*Q = 3.7;`

To test if 2 locations contain the same value, we must compare their contents rather than their addresses:

`*P == *Q`

.
Remember the difference between `P`

and `*P`

.
If we do `P = Q`

, we get:

but

`*P = *Q`

yields: