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The assignment operator, =, in contrast to all the other
binary operators that you have seen so far, associates from right to left.
Accordingly, the expression x = y = 5 is equivalent to the
expression x = (y = 5).
Fortunately, x = y = 5 does not mean (x = y) = 5,
because the value of an assignment statement, such as x = y, is
not a variable name. Thus, (x = y) = 5 makes no sense, and,
if the assignment operator were to associate left to right,
x = y = 5 would make no sense either.