slides/code/01-cpp/Rational.h.html

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<pre><i><span style="color:#9A1900">// File Rational.h</span></i>

<b><span style="color:#000080">#ifndef</span></b> RATIONAL_H
<b><span style="color:#000080">#define</span></b> RATIONAL_H

<b><span style="color:#0000FF">class</span></b> <span style="color:#008080">Rational</span> <span style="color:#FF0000">{</span>

<b><span style="color:#0000FF">public</span></b><span style="color:#990000">:</span>
    <i><span style="color:#9A1900">// default constructor</span></i>
    <b><span style="color:#000000">Rational</span></b><span style="color:#990000">();</span>

    <i><span style="color:#9A1900">// destructor</span></i>
    <span style="color:#990000">~</span><b><span style="color:#000000">Rational</span></b><span style="color:#990000">();</span>

    <i><span style="color:#9A1900">// create and initialize a new Rational object</span></i>
    <b><span style="color:#000000">Rational</span></b><span style="color:#990000">(</span><span style="color:#009900">int</span> numerator<span style="color:#990000">,</span> <span style="color:#009900">int</span> denominator<span style="color:#990000">);</span>

    <i><span style="color:#9A1900">// print string representation of (this) to cout</span></i>
    <span style="color:#009900">void</span> <b><span style="color:#000000">print</span></b><span style="color:#990000">()</span> <b><span style="color:#0000FF">const</span></b><span style="color:#990000">;</span>

    <i><span style="color:#9A1900">// return (this * b)</span></i>
    <span style="color:#008080">Rational</span> <b><span style="color:#000000">times</span></b><span style="color:#990000">(</span><span style="color:#008080">Rational</span> b<span style="color:#990000">)</span> <b><span style="color:#0000FF">const</span></b><span style="color:#990000">;</span>

    <i><span style="color:#9A1900">// return (this + b)</span></i>
    <span style="color:#008080">Rational</span> <b><span style="color:#000000">plus</span></b><span style="color:#990000">(</span><span style="color:#008080">Rational</span> b<span style="color:#990000">)</span> <b><span style="color:#0000FF">const</span></b><span style="color:#990000">;</span>

    <i><span style="color:#9A1900">// return (1 / this)</span></i>
    <span style="color:#008080">Rational</span> <b><span style="color:#000000">reciprocal</span></b><span style="color:#990000">()</span> <b><span style="color:#0000FF">const</span></b><span style="color:#990000">;</span>

    <i><span style="color:#9A1900">// return (this / b)</span></i>
    <span style="color:#008080">Rational</span> <b><span style="color:#000000">divides</span></b><span style="color:#990000">(</span><span style="color:#008080">Rational</span> b<span style="color:#990000">)</span> <b><span style="color:#0000FF">const</span></b><span style="color:#990000">;</span>

<b><span style="color:#0000FF">private</span></b><span style="color:#990000">:</span>
    <span style="color:#009900">int</span> num<span style="color:#990000">;</span>   <i><span style="color:#9A1900">// the numerator</span></i>
    <span style="color:#009900">int</span> den<span style="color:#990000">;</span>   <i><span style="color:#9A1900">// the denominator</span></i>

    <i><span style="color:#9A1900">/*************************************************************************</span></i>
<i><span style="color:#9A1900">    *  Helper functions</span></i>
<i><span style="color:#9A1900">    *************************************************************************/</span></i>
    <i><span style="color:#9A1900">// return gcd(m, n)</span></i>
    <span style="color:#009900">int</span> <b><span style="color:#000000">gcd</span></b><span style="color:#990000">(</span><span style="color:#009900">int</span> m<span style="color:#990000">,</span> <span style="color:#009900">int</span> n<span style="color:#990000">);</span>

<span style="color:#FF0000">}</span><span style="color:#990000">;</span>

<b><span style="color:#000080">#endif</span></b>
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