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<p>Convert hexadecimal number to octal number (with decimal intermediary)
<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 />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for hexadecimal_to_octal2.c:</div>
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Macros</h2></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><b>MAX_OCT_STR_LEN</b>&#160;&#160;&#160;23 /* 17_7777_7777_7777_7777_7777 */</td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><b>MAX_HEX_STR_LEN</b>&#160;&#160;&#160;17 /* FFFF_FFFF_FFFF_FFFF */</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ab83549c0d43c88544be47fa6c4885ae4"><td class="memItemLeft" align="right" valign="top">const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ab83549c0d43c88544be47fa6c4885ae4">hex_to_oct</a> (const char *hex)</td></tr>
<tr class="memdesc:ab83549c0d43c88544be47fa6c4885ae4"><td class="mdescLeft">&#160;</td><td class="mdescRight">for printf() and fgets() <a href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ab83549c0d43c88544be47fa6c4885ae4">More...</a><br /></td></tr>
<tr class="separator:ab83549c0d43c88544be47fa6c4885ae4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <a href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p >Convert hexadecimal number to octal number (with decimal intermediary) </p>
<p >The input is valid from 0 to 0xFFFF_FFFF_FFFF_FFFF.</p>
<p >At first, this program converts a hex string to an unsigned long long decimal, and then to an octal string.</p>
<p >When there is an invalid character in input string, this program stops parsing and converts the string until that character.</p>
<dl class="section see"><dt>See also</dt><dd>hexadecimal_to_octal.c </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="ab83549c0d43c88544be47fa6c4885ae4" name="ab83549c0d43c88544be47fa6c4885ae4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab83549c0d43c88544be47fa6c4885ae4">&#9670;&#160;</a></span>hex_to_oct()</h2>
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<td class="memname">const char * hex_to_oct </td>
<td>(</td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>hex</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>for printf() and fgets() </p>
<p >for memset()</p>
<p >Convert a hexadecimal number to octal number. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hex</td><td>Hexadecimal number to convert. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A pointer to the converted octal string. </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 25</span>{</div>
<div class="line"><span class="lineno"> 26</span><span class="preprocessor">#define MAX_OCT_STR_LEN 23 </span><span class="comment">/* 17_7777_7777_7777_7777_7777 */</span><span class="preprocessor"></span></div>
<div class="line"><span class="lineno"> 27</span> <span class="keyword">static</span> <span class="keywordtype">char</span> octal[MAX_OCT_STR_LEN];</div>
<div class="line"><span class="lineno"> 28</span> memset(octal, <span class="charliteral">&#39;\0&#39;</span>, MAX_OCT_STR_LEN); <span class="comment">// Initialize as NULL string</span></div>
<div class="line"><span class="lineno"> 29</span> </div>
<div class="line"><span class="lineno"> 30</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> decimal = 0;</div>
<div class="line"><span class="lineno"> 31</span> <span class="keywordtype">int</span> i = 0;</div>
<div class="line"><span class="lineno"> 32</span> <span class="keywordtype">int</span> len;</div>
<div class="line"><span class="lineno"> 33</span> </div>
<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">if</span> (hex == NULL)</div>
<div class="line"><span class="lineno"> 35</span> {</div>
<div class="line"><span class="lineno"> 36</span> <span class="comment">// Return an empty string</span></div>
<div class="line"><span class="lineno"> 37</span> <span class="keywordflow">return</span> octal;</div>
<div class="line"><span class="lineno"> 38</span> }</div>
<div class="line"><span class="lineno"> 39</span> </div>
<div class="line"><span class="lineno"> 40</span> <span class="comment">/* Hexadecimal to decimal conversion */</span></div>
<div class="line"><span class="lineno"> 41</span> <span class="keywordflow">while</span> (*hex != <span class="charliteral">&#39;\n&#39;</span> &amp;&amp; *hex != <span class="charliteral">&#39;\0&#39;</span>)</div>
<div class="line"><span class="lineno"> 42</span> {</div>
<div class="line"><span class="lineno"> 43</span> <span class="keywordtype">char</span> ch = *hex;</div>
<div class="line"><span class="lineno"> 44</span> </div>
<div class="line"><span class="lineno"> 45</span> <span class="keywordflow">if</span> (ch &gt;= <span class="charliteral">&#39;0&#39;</span> &amp;&amp; ch &lt;= <span class="charliteral">&#39;9&#39;</span>)</div>
<div class="line"><span class="lineno"> 46</span> {</div>
<div class="line"><span class="lineno"> 47</span> ch -= <span class="charliteral">&#39;0&#39;</span>;</div>
<div class="line"><span class="lineno"> 48</span> }</div>
<div class="line"><span class="lineno"> 49</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ch &gt;= <span class="charliteral">&#39;a&#39;</span> &amp;&amp; ch &lt;= <span class="charliteral">&#39;f&#39;</span>)</div>
<div class="line"><span class="lineno"> 50</span> {</div>
<div class="line"><span class="lineno"> 51</span> ch = ch - <span class="charliteral">&#39;a&#39;</span> + 10;</div>
<div class="line"><span class="lineno"> 52</span> }</div>
<div class="line"><span class="lineno"> 53</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ch &gt;= <span class="charliteral">&#39;A&#39;</span> &amp;&amp; ch &lt;= <span class="charliteral">&#39;F&#39;</span>)</div>
<div class="line"><span class="lineno"> 54</span> {</div>
<div class="line"><span class="lineno"> 55</span> ch = ch - <span class="charliteral">&#39;A&#39;</span> + 10;</div>
<div class="line"><span class="lineno"> 56</span> }</div>
<div class="line"><span class="lineno"> 57</span> <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno"> 58</span> {</div>
<div class="line"><span class="lineno"> 59</span> printf(<span class="stringliteral">&quot;Invalid hexadecimal input: %c\n&quot;</span>, ch);</div>
<div class="line"><span class="lineno"> 60</span> <span class="keywordflow">break</span>;</div>
<div class="line"><span class="lineno"> 61</span> }</div>
<div class="line"><span class="lineno"> 62</span> </div>
<div class="line"><span class="lineno"> 63</span> decimal *= 16;</div>
<div class="line"><span class="lineno"> 64</span> decimal += ch;</div>
<div class="line"><span class="lineno"> 65</span> hex++;</div>
<div class="line"><span class="lineno"> 66</span> }</div>
<div class="line"><span class="lineno"> 67</span> </div>
<div class="line"><span class="lineno"> 68</span> <span class="comment">/* Decimal to octal conversion */</span></div>
<div class="line"><span class="lineno"> 69</span> <span class="keywordflow">if</span> (decimal == 0)</div>
<div class="line"><span class="lineno"> 70</span> {</div>
<div class="line"><span class="lineno"> 71</span> octal[0] = <span class="charliteral">&#39;0&#39;</span>;</div>
<div class="line"><span class="lineno"> 72</span> len = 1;</div>
<div class="line"><span class="lineno"> 73</span> }</div>
<div class="line"><span class="lineno"> 74</span> <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno"> 75</span> {</div>
<div class="line"><span class="lineno"> 76</span> i = 0;</div>
<div class="line"><span class="lineno"> 77</span> <span class="keywordflow">while</span> (decimal &gt; 0)</div>
<div class="line"><span class="lineno"> 78</span> {</div>
<div class="line"><span class="lineno"> 79</span> octal[i] = <span class="charliteral">&#39;0&#39;</span> + decimal % 8;</div>
<div class="line"><span class="lineno"> 80</span> i++;</div>
<div class="line"><span class="lineno"> 81</span> decimal /= 8;</div>
<div class="line"><span class="lineno"> 82</span> }</div>
<div class="line"><span class="lineno"> 83</span> </div>
<div class="line"><span class="lineno"> 84</span> len = i;</div>
<div class="line"><span class="lineno"> 85</span> }</div>
<div class="line"><span class="lineno"> 86</span> </div>
<div class="line"><span class="lineno"> 87</span> octal[len] = <span class="charliteral">&#39;\0&#39;</span>;</div>
<div class="line"><span class="lineno"> 88</span> </div>
<div class="line"><span class="lineno"> 89</span> <span class="comment">/* Reverse the octal string */</span></div>
<div class="line"><span class="lineno"> 90</span> <span class="keywordflow">for</span> (i = 0; i &lt; len / 2; i++)</div>
<div class="line"><span class="lineno"> 91</span> {</div>
<div class="line"><span class="lineno"> 92</span> <span class="keywordtype">char</span> tmp = octal[i];</div>
<div class="line"><span class="lineno"> 93</span> octal[i] = octal[len - i - 1];</div>
<div class="line"><span class="lineno"> 94</span> octal[len - i - 1] = tmp;</div>
<div class="line"><span class="lineno"> 95</span> }</div>
<div class="line"><span class="lineno"> 96</span> </div>
<div class="line"><span class="lineno"> 97</span> <span class="keywordflow">return</span> octal;</div>
<div class="line"><span class="lineno"> 98</span>}</div>
</div><!-- fragment -->
</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>
<div class="fragment"><div class="line"><span class="lineno"> 105</span>{</div>
<div class="line"><span class="lineno"> 106</span><span class="preprocessor">#define MAX_HEX_STR_LEN 17 </span><span class="comment">/* FFFF_FFFF_FFFF_FFFF */</span><span class="preprocessor"></span></div>
<div class="line"><span class="lineno"> 107</span> <span class="keywordtype">char</span> hex[MAX_HEX_STR_LEN];</div>
<div class="line"><span class="lineno"> 108</span> </div>
<div class="line"><span class="lineno"> 109</span> <span class="comment">/* Input hexadecimal number from user */</span></div>
<div class="line"><span class="lineno"> 110</span> printf(<span class="stringliteral">&quot;Enter any hexadecimal number: &quot;</span>);</div>
<div class="line"><span class="lineno"> 111</span> fgets(hex, MAX_HEX_STR_LEN, stdin);</div>
<div class="line"><span class="lineno"> 112</span> </div>
<div class="line"><span class="lineno"> 113</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *octal = <a class="code hl_function" href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ab83549c0d43c88544be47fa6c4885ae4">hex_to_oct</a>(hex);</div>
<div class="line"><span class="lineno"> 114</span> </div>
<div class="line"><span class="lineno"> 115</span> printf(<span class="stringliteral">&quot;Hexadecimal number = %s\n&quot;</span>, hex);</div>
<div class="line"><span class="lineno"> 116</span> printf(<span class="stringliteral">&quot;Octal number = %s\n&quot;</span>, octal);</div>
<div class="line"><span class="lineno"> 117</span> </div>
<div class="line"><span class="lineno"> 118</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 119</span>}</div>
<div class="ttc" id="ahexadecimal__to__octal2_8c_html_ab83549c0d43c88544be47fa6c4885ae4"><div class="ttname"><a href="../../d0/dd9/hexadecimal__to__octal2_8c.html#ab83549c0d43c88544be47fa6c4885ae4">hex_to_oct</a></div><div class="ttdeci">const char * hex_to_oct(const char *hex)</div><div class="ttdoc">for printf() and fgets()</div><div class="ttdef"><b>Definition:</b> hexadecimal_to_octal2.c:24</div></div>
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