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blog/content/post/2008/06/20/2008-06-20-00000951.md

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---
title: ポインタを使った配列走査
author: kazu634
date: 2008-06-20
wordtwit_post_info:
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categories:
- C
- Programming
---
<div class="section">
<p>
　以下のプログラムは同じことをしている。
</p>
<pre class="syntax-highlight">
<span class="synPreProc">#include </span><span class="synConstant">&#60;stdio.h&#62;</span>
<span class="synType">int</span> array[] = {<span class="synConstant">4</span>, <span class="synConstant">5</span>, <span class="synConstant">8</span>, <span class="synConstant">9</span>, <span class="synConstant">8</span>, <span class="synConstant">1</span>, <span class="synConstant"></span>, <span class="synConstant">1</span>, <span class="synConstant">9</span>, <span class="synConstant">3</span>};
<span class="synType">void</span> show(<span class="synType">int</span> array[], <span class="synType">int</span> num){
<span class="synType">int</span> i;
<span class="synStatement">for</span> (i = <span class="synConstant"></span>;i &#60; num;i++) {
printf (<span class="synConstant">&#34;</span><span class="synSpecial">%d</span><span class="synConstant"> --&#62; </span><span class="synSpecial">%d\n</span><span class="synConstant">&#34;</span>, i, array[i]);
}
printf (<span class="synConstant">&#34;</span><span class="synSpecial">\n</span><span class="synConstant">&#34;</span>);
}
<span class="synType">int</span> main(){
<span class="synType">int</span> index = <span class="synConstant"></span>;
<span class="synType">int</span> num = <span class="synStatement">sizeof</span>(array) / <span class="synStatement">sizeof</span>(array[<span class="synConstant"></span>]);
show(array, num);
<span class="synStatement">while</span> (array[index] != <span class="synConstant"></span>) {
index++;
}
printf (<span class="synConstant">&#34;Number of elements before zero </span><span class="synSpecial">%d\n</span><span class="synConstant">&#34;</span>, index);
<span class="synStatement">return</span>(<span class="synConstant"></span>);
}
</pre>
<pre class="syntax-highlight">
<span class="synPreProc">#include </span><span class="synConstant">&#60;stdio.h&#62;</span>
<span class="synType">int</span> array[] = {<span class="synConstant">4</span>, <span class="synConstant">5</span>, <span class="synConstant">8</span>, <span class="synConstant">9</span>, <span class="synConstant">8</span>, <span class="synConstant">1</span>, <span class="synConstant"></span>, <span class="synConstant">1</span>, <span class="synConstant">9</span>, <span class="synConstant">3</span>};
<span class="synType">void</span> show(<span class="synType">int</span> array[], <span class="synType">int</span> num){
<span class="synType">int</span> i;
<span class="synStatement">for</span> (i = <span class="synConstant"></span>;i &#60; num;i++) {
printf (<span class="synConstant">&#34;</span><span class="synSpecial">%d</span><span class="synConstant"> --&#62; </span><span class="synSpecial">%d\n</span><span class="synConstant">&#34;</span>, i, array[i]);
}
printf (<span class="synConstant">&#34;</span><span class="synSpecial">\n</span><span class="synConstant">&#34;</span>);
}
<span class="synType">int</span> main(){
<span class="synType">int</span> *array_ptr = array;
<span class="synType">int</span> num = <span class="synStatement">sizeof</span>(array) / <span class="synStatement">sizeof</span>(array[<span class="synConstant"></span>]);
show(array, num);
<span class="synStatement">while</span> ((*array_ptr) != <span class="synConstant"></span>) {
array_ptr++;
}
printf (<span class="synConstant">&#34;Number of elements before zero </span><span class="synSpecial">%d\n</span><span class="synConstant">&#34;</span>, array_ptr - array);
<span class="synStatement">return</span>(<span class="synConstant"></span>);
}
</pre>
<p>
ここで、「array_ptr &#8211; array」は「現在の添え字番号 &#8211; 0」という意味になっている。
</p>
<p>
<center>
</center>
</p>
<div class="hatena-asin-detail">
<a href="http://www.amazon.co.jp/dp/4900900648/?tag=hatena_st1-22&ascsubtag=d-7ibv" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://www.amazon.co.jp/dp/4900900648/?tag=hatena_st1-22&ascsubtag=d-7ibv', '');"><img src="https://images-na.ssl-images-amazon.com/images/I/51PWS7A72YL._SL160_.jpg" class="hatena-asin-detail-image" alt="C実践プログラミング 第3版" title="C実践プログラミング 第3版" /></a></p>
<div class="hatena-asin-detail-info">
<p class="hatena-asin-detail-title">
<a href="http://www.amazon.co.jp/dp/4900900648/?tag=hatena_st1-22&ascsubtag=d-7ibv" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://www.amazon.co.jp/dp/4900900648/?tag=hatena_st1-22&ascsubtag=d-7ibv', 'C実践プログラミング 第3版');">C実践プログラミング 第3版</a>
</p>
<ul>
<li>
<span class="hatena-asin-detail-label">作者:</span> <a href="http://d.hatena.ne.jp/keyword/Steve%20Oualline" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/Steve%20Oualline', 'Steve Oualline');" class="keyword">Steve Oualline</a>,<a href="http://d.hatena.ne.jp/keyword/%CB%BE%B7%EE%B9%AF%BB%CA%28%B4%C6%CC%F5%29" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/%CB%BE%B7%EE%B9%AF%BB%CA%28%B4%C6%CC%F5%29', '望月康司(監訳)');" class="keyword">望月康司(監訳)</a>,<a href="http://d.hatena.ne.jp/keyword/%C3%AB%B8%FD%B8%F9" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/%C3%AB%B8%FD%B8%F9', '谷口功');" class="keyword">谷口功</a>
</li>
<li>
<span class="hatena-asin-detail-label">出版社/メーカー:</span> <a href="http://d.hatena.ne.jp/keyword/%A5%AA%A5%E9%A5%A4%A5%EA%A1%BC%A1%A6%A5%B8%A5%E3%A5%D1%A5%F3" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/%A5%AA%A5%E9%A5%A4%A5%EA%A1%BC%A1%A6%A5%B8%A5%E3%A5%D1%A5%F3', 'オライリー・ジャパン');" class="keyword">オライリー・ジャパン</a>
</li>
<li>
<span class="hatena-asin-detail-label">発売日:</span> 1998/06/15
</li>
<li>
<span class="hatena-asin-detail-label">メディア:</span> 大型本
</li>
<li>
<span class="hatena-asin-detail-label">購入</span>: 7人 <span class="hatena-asin-detail-label">クリック</span>: 158回
</li>
<li>
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</li>
</ul>
</div>
<div class="hatena-asin-detail-foot">
</div>
</div>
</div>
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