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    <p>This doesn't really make sense. The exponential form is simply an alternative way of expressing a complex number. For example</p> <pre><code> z = x + iy </code></pre> <p>is the standard real and imaginary component representation that you use in your first class. The exponential form is</p> <pre><code> z = r * exp(i * theta) </code></pre> <p>where <code>r</code> is the modulus and <code>theta</code> is the argument where</p> <pre><code> r = sqrt(x*x + y*y) </code></pre> <p>and </p> <pre><code> z = r*( cos(theta) + i*sin(theta)) </code></pre> <p>Essentially this is just converting the cartesian coordinates to the equivalent polar representation. </p> <p>You are storing a double in the second derived class called <code>exponential</code> which you are trying to calculate but really this value is meaningless. You are calculating the modulus as <code>module</code> correctly and the argument as <code>fi</code> but it appears you want <code>exponential</code> to be </p> <pre><code> module*exp(fi) </code></pre> <p>which is not really meaningful. If you want to store the values of modulus and argument that are correct for your values of <code>x</code> and <code>y</code> as cartesian real and imaginary components that would make more sense but storing just a double <code>exponential</code> is meaningless unless you have omitted something from the question.</p> <p>It seems that you would really be better off either just calculating the modulus and argument from your <code>re</code> and <code>im</code> variables and returning them from a function or storing them as additional member variables. </p>
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