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<title>Algorithms_in_C++: others/fast_integer_input.cpp File Reference</title>
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<div id="projectname">Algorithms_in_C++<span id="projectnumber"> 1.0.0</span>
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<div id="projectbrief">Set of algorithms implemented in C++.</div>
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@@ -132,32 +132,32 @@ Functions</h2></td></tr>
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</div><div class="memdoc">
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<p >Function to read the number from stdin. The function reads input until a non numeric character is entered. </p>
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<div class="fragment"><div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> {</div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// variable to indicate sign of input integer</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <span class="keywordtype">bool</span> negative = <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">register</span> <span class="keywordtype">int</span> c;</div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> *number = 0;</div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// extract current character from buffer</span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>();</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <span class="keywordflow">if</span> (c == <span class="charliteral">'-'</span>) {</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// number is negative</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> negative = <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// extract the next character from the buffer</span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>();</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> }</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// Keep on extracting characters if they are integers</span></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// i.e ASCII Value lies from '0'(48) to '9' (57)</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordflow">for</span> (; (c > 47 && c < 58); c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>())</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> *number = *number * 10 + c - 48;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// if scanned input has a negative sign, negate the</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// value of the input number</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">if</span> (negative)</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> *(number) *= -1;</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 11</span> {</div>
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<div class="line"><span class="lineno"> 12</span> <span class="comment">// variable to indicate sign of input integer</span></div>
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<div class="line"><span class="lineno"> 13</span> <span class="keywordtype">bool</span> negative = <span class="keyword">false</span>;</div>
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<div class="line"><span class="lineno"> 14</span> <span class="keyword">register</span> <span class="keywordtype">int</span> c;</div>
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<div class="line"><span class="lineno"> 15</span> *number = 0;</div>
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<div class="line"><span class="lineno"> 16</span> </div>
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<div class="line"><span class="lineno"> 17</span> <span class="comment">// extract current character from buffer</span></div>
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<div class="line"><span class="lineno"> 18</span> c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>();</div>
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<div class="line"><span class="lineno"> 19</span> <span class="keywordflow">if</span> (c == <span class="charliteral">'-'</span>) {</div>
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<div class="line"><span class="lineno"> 20</span> <span class="comment">// number is negative</span></div>
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<div class="line"><span class="lineno"> 21</span> negative = <span class="keyword">true</span>;</div>
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<div class="line"><span class="lineno"> 22</span> </div>
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<div class="line"><span class="lineno"> 23</span> <span class="comment">// extract the next character from the buffer</span></div>
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<div class="line"><span class="lineno"> 24</span> c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>();</div>
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<div class="line"><span class="lineno"> 25</span> }</div>
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<div class="line"><span class="lineno"> 26</span> </div>
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<div class="line"><span class="lineno"> 27</span> <span class="comment">// Keep on extracting characters if they are integers</span></div>
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<div class="line"><span class="lineno"> 28</span> <span class="comment">// i.e ASCII Value lies from '0'(48) to '9' (57)</span></div>
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<div class="line"><span class="lineno"> 29</span> <span class="keywordflow">for</span> (; (c > 47 && c < 58); c = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a>())</div>
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<div class="line"><span class="lineno"> 30</span> *number = *number * 10 + c - 48;</div>
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<div class="line"><span class="lineno"> 31</span> </div>
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<div class="line"><span class="lineno"> 32</span> <span class="comment">// if scanned input has a negative sign, negate the</span></div>
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<div class="line"><span class="lineno"> 33</span> <span class="comment">// value of the input number</span></div>
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<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">if</span> (negative)</div>
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<div class="line"><span class="lineno"> 35</span> *(number) *= -1;</div>
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<div class="line"><span class="lineno"> 36</span>}</div>
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<div class="ttc" id="agetchar_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/c/getchar.html">std::getchar</a></div><div class="ttdeci">T getchar(T... args)</div></div>
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</div><!-- fragment --><div class="dynheader">
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Here is the call graph for this function:</div>
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@@ -184,12 +184,12 @@ Here is the call graph for this function:</div>
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</table>
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</div><div class="memdoc">
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<p >Main function </p>
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<div class="fragment"><div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> {</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordtype">int</span> number;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <a class="code hl_function" href="../../d9/df0/fast__integer__input_8cpp.html#a4e097ac8509b717bdc8ab09ecd86ae82">fastinput</a>(&number);</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << number << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 39</span> {</div>
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<div class="line"><span class="lineno"> 40</span> <span class="keywordtype">int</span> number;</div>
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<div class="line"><span class="lineno"> 41</span> <a class="code hl_function" href="../../d9/df0/fast__integer__input_8cpp.html#a4e097ac8509b717bdc8ab09ecd86ae82">fastinput</a>(&number);</div>
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<div class="line"><span class="lineno"> 42</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << number << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 43</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 44</span>}</div>
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<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
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<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
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<div class="ttc" id="afast__integer__input_8cpp_html_a4e097ac8509b717bdc8ab09ecd86ae82"><div class="ttname"><a href="../../d9/df0/fast__integer__input_8cpp.html#a4e097ac8509b717bdc8ab09ecd86ae82">fastinput</a></div><div class="ttdeci">void fastinput(int *number)</div><div class="ttdef"><b>Definition:</b> fast_integer_input.cpp:11</div></div>
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@@ -208,7 +208,7 @@ Here is the call graph for this function:</div>
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<li class="navelem"><a class="el" href="../../dir_9510827d0b234b3cc54b29892f217477.html">others</a></li><li class="navelem"><a class="el" href="../../d9/df0/fast__integer__input_8cpp.html">fast_integer_input.cpp</a></li>
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<li class="footer">Generated by <a href="https://www.doxygen.org/index.html"><img class="footer" src="../../doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.2 </li>
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