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<div class="headertitle"><div class="title">queue_using_two_stacks.cpp</div></div>
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<a href="../../df/dd0/queue__using__two__stacks_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &lt;cassert&gt;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &lt;stack&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="keyword">namespace </span>{</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="keyword">class </span>MyQueue {</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">private</span>:</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> std::stack&lt;T&gt; s1, s2;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> MyQueue() = <span class="keywordflow">default</span>;</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordtype">void</span> push(T x);</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">const</span> T&amp; pop();</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">const</span> T&amp; peek() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordtype">bool</span> empty() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>};</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="keywordtype">void</span> MyQueue&lt;T&gt;::push(T x) {</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">while</span> (!s2.empty()) {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> s1.push(s2.top());</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> s2.pop();</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> }</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> s2.push(x);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">while</span> (!s1.empty()) {</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> s2.push(s1.top());</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> s1.pop();</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> }</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span>}</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="keyword">const</span> T&amp; MyQueue&lt;T&gt;::pop() {</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">const</span> T&amp; temp = MyQueue::peek();</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> s2.pop();</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">return</span> temp;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span>}</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="keyword">const</span> T&amp; MyQueue&lt;T&gt;::peek()<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">if</span> (!empty()) {</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">return</span> s2.top();</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> }</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> std::cerr &lt;&lt; <span class="stringliteral">&quot;Queue is empty&quot;</span> &lt;&lt; std::endl;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> exit(0);</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span>}</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="keywordtype">bool</span> MyQueue&lt;T&gt;::empty()<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="keywordflow">return</span> s2.empty() &amp;&amp; s1.empty();</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span>}</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span>} <span class="comment">// namespace</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="foldopen" id="foldopen00101" data-start="{" data-end="}">
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"><a class="line" href="../../df/dd0/queue__using__two__stacks_8cpp.html#a831ded10ecad88c14a8e22b96f4c1863"> 101</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../df/dd0/queue__using__two__stacks_8cpp.html#a831ded10ecad88c14a8e22b96f4c1863">queue_test</a>() {</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> MyQueue&lt;int&gt; que;</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Test #1\n&quot;</span>;</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> que.push(2);</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> que.push(5);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> que.push(0);</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> assert(que.peek() == 2);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> assert(que.pop() == 2);</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> assert(que.peek() == 5);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> assert(que.pop() == 5);</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> assert(que.peek() == 0);</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> assert(que.pop() == 0);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> assert(que.empty() == <span class="keyword">true</span>);</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> std::cout &lt;&lt; <span class="stringliteral">&quot;PASSED\n&quot;</span>;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Test #2\n&quot;</span>;</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> que.push(-1);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> assert(que.empty() == <span class="keyword">false</span>);</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> assert(que.peek() == -1);</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> assert(que.pop() == -1);</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> std::cout &lt;&lt; <span class="stringliteral">&quot;PASSED\n&quot;</span>;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> </div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> MyQueue&lt;double&gt; que2;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Test #3\n&quot;</span>;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> que2.push(2.31223);</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> que2.push(3.1415926);</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> que2.push(2.92);</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> assert(que2.peek() == 2.31223);</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> assert(que2.pop() == 2.31223);</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> assert(que2.peek() == 3.1415926);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> assert(que2.pop() == 3.1415926);</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> assert(que2.peek() == 2.92);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> assert(que2.pop() == 2.92);</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> std::cout &lt;&lt; <span class="stringliteral">&quot;PASSED\n&quot;</span>;</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span>}</div>
</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="foldopen" id="foldopen00141" data-start="{" data-end="}">
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"><a class="line" href="../../df/dd0/queue__using__two__stacks_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 141</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../df/dd0/queue__using__two__stacks_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <a class="code hl_function" href="../../df/dd0/queue__using__two__stacks_8cpp.html#a831ded10ecad88c14a8e22b96f4c1863">queue_test</a>();</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span>}</div>
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<div class="ttc" id="aqueue__using__two__stacks_8cpp_html_a831ded10ecad88c14a8e22b96f4c1863"><div class="ttname"><a href="../../df/dd0/queue__using__two__stacks_8cpp.html#a831ded10ecad88c14a8e22b96f4c1863">queue_test</a></div><div class="ttdeci">void queue_test()</div><div class="ttdef"><b>Definition</b> <a href="#l00101">queue_using_two_stacks.cpp:101</a></div></div>
<div class="ttc" id="aqueue__using__two__stacks_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../df/dd0/queue__using__two__stacks_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00141">queue_using_two_stacks.cpp:141</a></div></div>
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