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<p><a href="https://www.includehelp.com/c/evaluation-of-postfix-expressions-using-stack-with-c-program.aspx" target="_blank">Postfix evaluation algorithm</a> implementation
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;string.h&gt;</code><br />
<code>#include &lt;ctype.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
<code>#include &lt;stdint.h&gt;</code><br />
<code>#include &lt;assert.h&gt;</code><br />
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Include dependency graph for postfix_evaluation.c:</div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d10/struct_stack.html">Stack</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">for printf() and scanf() <a href="../../dd/d10/struct_stack.html#details">More...</a><br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:af395c540f7e70a8d82d055a0aa42bbef"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d43/postfix__evaluation_8c.html#af395c540f7e70a8d82d055a0aa42bbef">push</a> (int8_t opd)</td></tr>
<tr class="memdesc:af395c540f7e70a8d82d055a0aa42bbef"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to push on the stack. <br /></td></tr>
<tr class="separator:af395c540f7e70a8d82d055a0aa42bbef"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8546e4b3f61be1f09ce47f428116ad7d"><td class="memItemLeft" align="right" valign="top">int8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d43/postfix__evaluation_8c.html#a8546e4b3f61be1f09ce47f428116ad7d">pop</a> ()</td></tr>
<tr class="memdesc:a8546e4b3f61be1f09ce47f428116ad7d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to pop from the stack. <br /></td></tr>
<tr class="separator:a8546e4b3f61be1f09ce47f428116ad7d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4494492c8fc2509f602acc8228a3b623"><td class="memItemLeft" align="right" valign="top">int8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d43/postfix__evaluation_8c.html#a4494492c8fc2509f602acc8228a3b623">evaluate</a> (char post[])</td></tr>
<tr class="memdesc:a4494492c8fc2509f602acc8228a3b623"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to evaluate postfix expression. <br /></td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d43/postfix__evaluation_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self-test implementations. <br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d43/postfix__evaluation_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></td></tr>
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Variables</h2></td></tr>
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struct <a class="el" href="../../dd/d10/struct_stack.html">Stack</a>&#160;</td><td class="memItemRight" valign="bottom"><b>st</b></td></tr>
<tr class="memdesc:a791cc5e78425bce611db4e3bdc4b19d5"><td class="mdescLeft">&#160;</td><td class="mdescRight">global declaration of stack st <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p><a href="https://www.includehelp.com/c/evaluation-of-postfix-expressions-using-stack-with-c-program.aspx" target="_blank">Postfix evaluation algorithm</a> implementation </p>
<p>The input postfix expression is of type string upto 49 characters (including space delimiters). Supported operations- '+', '-', '/', '*', '' </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kumaryash18" target="_blank">Kumar Yash</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a4494492c8fc2509f602acc8228a3b623" name="a4494492c8fc2509f602acc8228a3b623"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4494492c8fc2509f602acc8228a3b623">&#9670;&#160;</a></span>evaluate()</h2>
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<td class="memname">int8_t evaluate </td>
<td>(</td>
<td class="paramtype">char&#160;</td>
<td class="paramname"><em>post</em>[]</td><td>)</td>
<td></td>
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<p>Function to evaluate postfix expression. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">post</td><td>the input postfix expression </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>evaluated answer </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 60</span> {</div>
<div class="line"><span class="lineno"> 61</span> int8_t it1;</div>
<div class="line"><span class="lineno"> 62</span> int8_t it2;</div>
<div class="line"><span class="lineno"> 63</span> int8_t temp;</div>
<div class="line"><span class="lineno"> 64</span> int8_t number;</div>
<div class="line"><span class="lineno"> 65</span> <span class="keywordtype">int</span> i;</div>
<div class="line"><span class="lineno"> 66</span> <span class="keywordflow">for</span>(i = 0; i &lt; strlen(post); i++) {</div>
<div class="line"><span class="lineno"> 67</span> <span class="keywordflow">if</span>(post[i] == <span class="charliteral">&#39; &#39;</span>) {</div>
<div class="line"><span class="lineno"> 68</span> <span class="keywordflow">continue</span>; <span class="comment">// ignore delimiter</span></div>
<div class="line"><span class="lineno"> 69</span> }</div>
<div class="line"><span class="lineno"> 70</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span>(isdigit(post[i])) {</div>
<div class="line"><span class="lineno"> 71</span> number = 0;</div>
<div class="line"><span class="lineno"> 72</span> <span class="keywordflow">do</span> {</div>
<div class="line"><span class="lineno"> 73</span> number = number * 10 + (post[i]-<span class="charliteral">&#39;0&#39;</span>);</div>
<div class="line"><span class="lineno"> 74</span> i++;</div>
<div class="line"><span class="lineno"> 75</span> } <span class="keywordflow">while</span>(i &lt; strlen(post) &amp;&amp; isdigit(post[i]));</div>
<div class="line"><span class="lineno"> 76</span> <a class="code hl_function" href="../../db/d0c/infix__to__postfix_8c.html#a613462735d30cae1b85b606ecab30554">push</a>(number);</div>
<div class="line"><span class="lineno"> 77</span> }</div>
<div class="line"><span class="lineno"> 78</span> <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 79</span> it2 = <a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#a8546e4b3f61be1f09ce47f428116ad7d">pop</a>();</div>
<div class="line"><span class="lineno"> 80</span> it1 = <a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#a8546e4b3f61be1f09ce47f428116ad7d">pop</a>();</div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">switch</span>(post[i]) {</div>
<div class="line"><span class="lineno"> 82</span> <span class="keywordflow">case</span> <span class="charliteral">&#39;+&#39;</span>:</div>
<div class="line"><span class="lineno"> 83</span> temp = it1 + it2; <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 84</span> <span class="keywordflow">case</span> <span class="charliteral">&#39;-&#39;</span>:</div>
<div class="line"><span class="lineno"> 85</span> temp = it1 - it2; <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 86</span> <span class="keywordflow">case</span> <span class="charliteral">&#39;*&#39;</span>:</div>
<div class="line"><span class="lineno"> 87</span> temp = it1 * it2; <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 88</span> <span class="keywordflow">case</span> <span class="charliteral">&#39;/&#39;</span>:</div>
<div class="line"><span class="lineno"> 89</span> temp = it1 / it2; <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 90</span> <span class="keywordflow">case</span> <span class="charliteral">&#39;%&#39;</span>:</div>
<div class="line"><span class="lineno"> 91</span> temp = it1 % it2; <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 92</span> <span class="keywordflow">default</span>:</div>
<div class="line"><span class="lineno"> 93</span> printf(<span class="stringliteral">&quot;Invalid operator&quot;</span>); exit(1);</div>
<div class="line"><span class="lineno"> 94</span> }</div>
<div class="line"><span class="lineno"> 95</span> <a class="code hl_function" href="../../db/d0c/infix__to__postfix_8c.html#a613462735d30cae1b85b606ecab30554">push</a>(temp);</div>
<div class="line"><span class="lineno"> 96</span> }</div>
<div class="line"><span class="lineno"> 97</span> }</div>
<div class="line"><span class="lineno"> 98</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#a8546e4b3f61be1f09ce47f428116ad7d">pop</a>();</div>
<div class="line"><span class="lineno"> 99</span>}</div>
<div class="ttc" id="ainfix__to__postfix_8c_html_a613462735d30cae1b85b606ecab30554"><div class="ttname"><a href="../../db/d0c/infix__to__postfix_8c.html#a613462735d30cae1b85b606ecab30554">push</a></div><div class="ttdeci">void push(struct Stack *p, char ch)</div><div class="ttdoc">push function</div><div class="ttdef"><b>Definition:</b> infix_to_postfix.c:55</div></div>
<div class="ttc" id="apostfix__evaluation_8c_html_a8546e4b3f61be1f09ce47f428116ad7d"><div class="ttname"><a href="../../df/d43/postfix__evaluation_8c.html#a8546e4b3f61be1f09ce47f428116ad7d">pop</a></div><div class="ttdeci">int8_t pop()</div><div class="ttdoc">Function to pop from the stack.</div><div class="ttdef"><b>Definition:</b> postfix_evaluation.c:44</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
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<p>Main function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<p>initialize</p>
<p>run self-test implementations</p>
<div class="fragment"><div class="line"><span class="lineno"> 124</span> {</div>
<div class="line"><span class="lineno"> 125</span> <a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a> = -1; <span class="comment">/// initialize</span></div>
<div class="line"><span class="lineno"> 126</span> <a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">/// run self-test implementations</span></div>
<div class="line"><span class="lineno"> 127</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 128</span>}</div>
<div class="ttc" id="apostfix__evaluation_8c_html_a791cc5e78425bce611db4e3bdc4b19d5"><div class="ttname"><a href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a></div><div class="ttdeci">struct Stack st</div><div class="ttdoc">global declaration of stack st</div><div class="ttdef"><b>Definition:</b> postfix_evaluation.c:24</div></div>
<div class="ttc" id="apostfix__evaluation_8c_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../df/d43/postfix__evaluation_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition:</b> postfix_evaluation.c:105</div></div>
<div class="ttc" id="astruct_stack_html_ad62fb36816185f3eef3a6f735a61f54a"><div class="ttname"><a href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">Stack::top</a></div><div class="ttdeci">int top</div><div class="ttdoc">stores index of the top element</div><div class="ttdef"><b>Definition:</b> infix_to_postfix2.c:23</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a8546e4b3f61be1f09ce47f428116ad7d">&#9670;&#160;</a></span>pop()</h2>
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<td class="memname">int8_t pop </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
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</div><div class="memdoc">
<p>Function to pop from the stack. </p>
<dl class="section return"><dt>Returns</dt><dd>popped number </dd></dl>
<p>&lt; to store the popped value to be returned</p>
<div class="fragment"><div class="line"><span class="lineno"> 44</span> {</div>
<div class="line"><span class="lineno"> 45</span> int8_t item; <span class="comment">///&lt; to store the popped value to be returned</span></div>
<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">if</span>(<a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a> == -1) { <span class="comment">// underflow condition</span></div>
<div class="line"><span class="lineno"> 47</span> printf(<span class="stringliteral">&quot;Stack underflow...&quot;</span>);</div>
<div class="line"><span class="lineno"> 48</span> exit(1);</div>
<div class="line"><span class="lineno"> 49</span> }</div>
<div class="line"><span class="lineno"> 50</span> item = <a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#a856ca6f4a9ffde43f0cb3b43cb4d044d">stack</a>[<a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a>];</div>
<div class="line"><span class="lineno"> 51</span> <a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a>--;</div>
<div class="line"><span class="lineno"> 52</span> <span class="keywordflow">return</span> item;</div>
<div class="line"><span class="lineno"> 53</span>}</div>
<div class="ttc" id="astruct_stack_html_a856ca6f4a9ffde43f0cb3b43cb4d044d"><div class="ttname"><a href="../../dd/d10/struct_stack.html#a856ca6f4a9ffde43f0cb3b43cb4d044d">Stack::stack</a></div><div class="ttdeci">char stack[10]</div><div class="ttdoc">array stack</div><div class="ttdef"><b>Definition:</b> infix_to_postfix2.c:22</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#af395c540f7e70a8d82d055a0aa42bbef">&#9670;&#160;</a></span>push()</h2>
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<td class="memname">void push </td>
<td>(</td>
<td class="paramtype">int8_t&#160;</td>
<td class="paramname"><em>opd</em></td><td>)</td>
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<p>Function to push on the stack. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">opd</td><td>number to be pushed in the stack </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 31</span> {</div>
<div class="line"><span class="lineno"> 32</span> <span class="keywordflow">if</span>(<a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a> == 19) { <span class="comment">// overflow condition</span></div>
<div class="line"><span class="lineno"> 33</span> printf(<span class="stringliteral">&quot;Stack overflow...&quot;</span>);</div>
<div class="line"><span class="lineno"> 34</span> exit(1);</div>
<div class="line"><span class="lineno"> 35</span> }</div>
<div class="line"><span class="lineno"> 36</span> <a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a>++;</div>
<div class="line"><span class="lineno"> 37</span> <a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#a856ca6f4a9ffde43f0cb3b43cb4d044d">stack</a>[<a class="code hl_variable" href="../../df/d43/postfix__evaluation_8c.html#a791cc5e78425bce611db4e3bdc4b19d5">st</a>.<a class="code hl_variable" href="../../dd/d10/struct_stack.html#ad62fb36816185f3eef3a6f735a61f54a">top</a>] = opd;</div>
<div class="line"><span class="lineno"> 38</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">&#9670;&#160;</a></span>test()</h2>
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<td class="memname">static void test </td>
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<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
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<p>Self-test implementations. </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<p>this ensures that the algorithm works as expected</p>
<p>this ensures that the algorithm works as expected</p>
<div class="fragment"><div class="line"><span class="lineno"> 105</span> {</div>
<div class="line"><span class="lineno"> 106</span> <span class="comment">/* check sample test case</span></div>
<div class="line"><span class="lineno"> 107</span><span class="comment"> input: &quot;2 10 + 9 6 - /&quot;</span></div>
<div class="line"><span class="lineno"> 108</span><span class="comment"> expected output: 4</span></div>
<div class="line"><span class="lineno"> 109</span><span class="comment"> */</span></div>
<div class="line"><span class="lineno"> 110</span> <span class="keywordtype">char</span> temp1[50] = <span class="stringliteral">&quot;2 10 + 9 6 - /&quot;</span>;</div>
<div class="line"><span class="lineno"> 111</span> assert(<a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#a4494492c8fc2509f602acc8228a3b623">evaluate</a>(temp1) == 4); <span class="comment">/// this ensures that the algorithm works as expected</span></div>
<div class="line"><span class="lineno"> 112</span> <span class="comment">/* input: &quot;4 2 + 3 5 1 - * +&quot;</span></div>
<div class="line"><span class="lineno"> 113</span><span class="comment"> expected output: 18</span></div>
<div class="line"><span class="lineno"> 114</span><span class="comment"> */</span></div>
<div class="line"><span class="lineno"> 115</span> <span class="keywordtype">char</span> temp2[50] = <span class="stringliteral">&quot;4 2 + 3 5 1 - * +&quot;</span>;</div>
<div class="line"><span class="lineno"> 116</span> assert(<a class="code hl_function" href="../../df/d43/postfix__evaluation_8c.html#a4494492c8fc2509f602acc8228a3b623">evaluate</a>(temp2) == 18); <span class="comment">/// this ensures that the algorithm works as expected</span></div>
<div class="line"><span class="lineno"> 117</span> printf(<span class="stringliteral">&quot;All tests have successfully passed!\n&quot;</span>);</div>
<div class="line"><span class="lineno"> 118</span>}</div>
<div class="ttc" id="apostfix__evaluation_8c_html_a4494492c8fc2509f602acc8228a3b623"><div class="ttname"><a href="../../df/d43/postfix__evaluation_8c.html#a4494492c8fc2509f602acc8228a3b623">evaluate</a></div><div class="ttdeci">int8_t evaluate(char post[])</div><div class="ttdoc">Function to evaluate postfix expression.</div><div class="ttdef"><b>Definition:</b> postfix_evaluation.c:60</div></div>
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