In C an assignment is an expression where the value is the new value of what was being assigned to.

In a = b = 1, both a and b will be 1.

a = *(p = p + 1)

is the same as

p += 1
a = *p

, so ++p.

Perhaps *(p += 1) will be to your liking?

It's ice cream. Apparently having the three flavours like this is called "Neapolitan ice cream".