4exerc.html

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<h3>Exercises</h3>

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<p><li>Design a program that calculates all the prime numbers up to 100 by eliminating all the numbers divisible by 2, 3, 5 and 7. Create an abstract class <var>Sieve</var> with one pure virtual method <var>NextNumber</var>. Implement a <var>SourceSieve</var> that simply iterates over all numbers from 1 to 100 in order. Implement <var>Sieve2</var> that takes a reference to a <var>Sieve</var> in its constructor, and when asked to give the next number, keeps retrieving numbers from its child sieve until it finds one that is not divisible by 2 and returns it. Do the same for 3, 5 and 7. Create all these <var>Sieves</var> as local objects in <var>main</var>, chain them, and print all the numbers returned by the top <var>Sieve</var>. What order of <var>Sieve</var>s is best?</li>


<p><li>Create an abstract class <var>Command</var> with two pure virtual methods <var>Execute</var> and <var>Undo</var>. Create command classes for our stack-based calculator, corresponding to all possible calculator inputs. For every user input construct a corresponding <var>Command</var> object, <var>Execute</var> it and push it on a two-deep stack of <var>Command</var> s. Add the 憉

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