Assume functions <code>a</code> and <code>b</code> return boolean values, and further, the execution of function <code>b</code> takes considerable resources without side effects, <!--treating the printing as being for illustrative purposes only--> and is to be minimized.
If we needed to compute the conjunction (<code>and</code>):
:::: <code> x = a() and b() </code>
Then it would be best to not compute the value of <code>b()</code> if the value of <code>a()</code> is computed as <code>false</code>, as the value of <code>x</code> can then only ever be <code> false</code>.
Then it would be best to not compute the value of <code>b()</code> if the value of <code>a()</code> is computed as <code>true</code>, as the value of <code>y</code> can then only ever be <code>true</code>.
Some languages will stop further computation of boolean equations as soon as the result is known, so-called [[wp:Short-circuit evaluation|short-circuit evaluation]] of boolean expressions
;Task:
Create two functions named <code>a</code> and <code>b</code>, that take and return the same boolean value.
The functions should also print their name whenever they are called.
Calculate and assign the values of the following equations to a variable in such a way that function <code>b</code> is only called when necessary:
