View source for Dabeen Park/C /Solvequadraticequation

<p>#include &lt;iostream&gt;<br />
#include &lt;iomanip&gt;<br />
#include &lt;cmath&gt;<br />
#include &lt;cstring&gt;<br />
using namespace std;<br />
int main()<br />
{<br />
&nbsp;&nbsp; &nbsp;int a, b, c;<br />
&nbsp;&nbsp; &nbsp;double small_solution, large_solution;</p>

<p>&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;Quadratic equation solver&quot;;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;Factor a quadratic equation ax^2 + bx + c = 0 if real roots exist.&quot;;</p>

<p>&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;Please enter the coefficient a: &quot;;<br />
&nbsp;&nbsp; &nbsp;cin &gt;&gt; a;<br />
&nbsp;&nbsp; &nbsp;if(a == 0)<br />
&nbsp;&nbsp; &nbsp;{<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;This is not a quadratic equation. No factorization is needed.&quot; &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;exit(0);<br />
&nbsp;&nbsp; &nbsp;}<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;Please enter the coefficient b: &quot;;<br />
&nbsp;&nbsp; &nbsp;cin &gt;&gt; b;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;Please enter the coefficient c: &quot;;<br />
&nbsp;&nbsp; &nbsp;cin &gt;&gt; c;<br />
&nbsp;&nbsp; &nbsp;small_solution = static_cast&lt;double&gt;((-b-sqrt(b^2-(4*a*c)))/(2*a));<br />
&nbsp;&nbsp; &nbsp;large_solution = static_cast&lt;double&gt;((-b+sqrt(b^2-(4*a*c)))/(2*a));<br />
&nbsp;&nbsp; &nbsp;if(small_solution == large_solution)<br />
&nbsp;&nbsp; &nbsp;{<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The equation has one real root: &quot; &lt;&lt; small_solution &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; fixed &lt;&lt; showpoint &lt;&lt; precision(2);<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The factorization of the equation is: (x -&quot; &lt;&lt; abs(small_solution) &lt;&lt; &quot;)^2 = 0&quot; &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;exit(0);<br />
&nbsp;&nbsp; &nbsp;}<br />
&nbsp;&nbsp; &nbsp;else if(small_solution is not real number &amp;&amp; large_solution is not real number)<br />
&nbsp;&nbsp; &nbsp;{<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;There is no real root.&quot; &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;exit(0);<br />
&nbsp;&nbsp; &nbsp;}<br />
&nbsp;&nbsp; &nbsp;else if(small_solution is real number &amp;&amp; large_solution is real number)<br />
&nbsp;&nbsp; &nbsp;{<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The equation has two real roots.&quot; &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; fixed &lt;&lt; showpoint &lt;&lt; precision(2);<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The smaller root is &quot; &lt;&lt; small_solution &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The larger root is &quot; &lt;&lt; large_solution &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;cout &lt;&lt; &quot;The factorization of the equation is: (x -&quot; &lt;&lt; abs(small_solution) &lt;&lt; &quot;)(x -&quot; &lt;&lt; abs(large_solution) &lt;&lt; &quot;) = 0&quot; &lt;&lt; endl;<br />
&nbsp;&nbsp; &nbsp;exit(0);<br />
&nbsp;&nbsp; &nbsp;}<br />
&nbsp;&nbsp; &nbsp;return 0;<br />
}</p>