Chapter 10, Problem 18E

Look at the code below. You have four classes (0, X, T, and M) and a variable of each of these.

$\begin{array}{l}\text{0 o};\\ \text{X x};\\ \text{T t};\\ \text{M m};\end{array}$

The following assignments are all legal (assume that they all compile):

$\begin{array}{l}\text{m }=\text{ t};\\ \text{m }=\text{ x};\\ \text{o }=\text{ t};\end{array}$

The following assignments are all illegal (they cause compiler errors):

$\begin{array}{l}\text{o }=\text{ m;}\\ \text{o }=\text{ x; }\\ \text{X }=\text{ o};\end{array}$

What can you say about the relationships of these classes? Draw a class diagram.