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Copy pathC语言 设一个函数process，调用它时，实现不同功能。.html
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C语言 设一个函数process，调用它时，实现不同功能。.html
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<p>//凯鲁嘎吉 - 博客园 http://www.cnblogs.com/kailugaji/</p>
<p>输入a, b,第一次调用process找最大值，第二次调用process找最小值，第三次调用求和。</p>
<p>方法1：</p>
<div class="cnblogs_code">
<pre><span style="color: #008080;"> 1</span> #include<stdio.h>
<span style="color: #008080;"> 2</span> <span style="color: #008000;">//</span><span style="color: #008000;">求最大</span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;">int</span> max(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">return</span> x>y?<span style="color: #000000;">x:y;
</span><span style="color: #008080;"> 5</span> <span style="color: #000000;">}
</span><span style="color: #008080;"> 6</span> <span style="color: #008000;">//</span><span style="color: #008000;">求最小</span>
<span style="color: #008080;"> 7</span> <span style="color: #0000ff;">int</span> min(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">return</span> x<y?<span style="color: #000000;">x:y;
</span><span style="color: #008080;"> 9</span> <span style="color: #000000;">}
</span><span style="color: #008080;">10</span> <span style="color: #008000;">//</span><span style="color: #008000;">求和</span>
<span style="color: #008080;">11</span> <span style="color: #0000ff;">int</span> add(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;">12</span> <span style="color: #0000ff;">return</span> x+<span style="color: #000000;">y;
</span><span style="color: #008080;">13</span> <span style="color: #000000;">}
</span><span style="color: #008080;">14</span> <span style="color: #008000;">//</span><span style="color: #008000;">类似多态</span>
<span style="color: #008080;">15</span> <span style="color: #0000ff;">void</span> process(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span> y,<span style="color: #0000ff;">int</span> (*<span style="color: #000000;">fun)){
</span><span style="color: #008080;">16</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> z;
</span><span style="color: #008080;">17</span> <span style="color: #0000ff;">if</span>(fun==<span style="color: #000000;">max)
</span><span style="color: #008080;">18</span> z=<span style="color: #000000;">max(x,y);
</span><span style="color: #008080;">19</span> <span style="color: #0000ff;">if</span>(fun==<span style="color: #000000;">min)
</span><span style="color: #008080;">20</span> z=<span style="color: #000000;">min(x,y);
</span><span style="color: #008080;">21</span> <span style="color: #0000ff;">if</span>(fun==<span style="color: #000000;">add)
</span><span style="color: #008080;">22</span> z=<span style="color: #000000;">add(x,y);
</span><span style="color: #008080;">23</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">%d\n</span><span style="color: #800000;">"</span><span style="color: #000000;">,z);
</span><span style="color: #008080;">24</span> <span style="color: #000000;">}
</span><span style="color: #008080;">25</span>
<span style="color: #008080;">26</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> main(){
</span><span style="color: #008080;">27</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> a,b;
</span><span style="color: #008080;">28</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">Please input a and b:\n</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">29</span> scanf(<span style="color: #800000;">"</span><span style="color: #800000;">%d %d</span><span style="color: #800000;">"</span>, &a, &<span style="color: #000000;">b);
</span><span style="color: #008080;">30</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">max=</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">31</span> <span style="color: #000000;"> process(a,b,max);
</span><span style="color: #008080;">32</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">min=</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">33</span> <span style="color: #000000;"> process(a,b,min);
</span><span style="color: #008080;">34</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">sum=</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">35</span> <span style="color: #000000;"> process(a,b,add);
</span><span style="color: #008080;">36</span> }</pre>
</div>
<p>方法2：</p>
<div class="cnblogs_code">
<pre><span style="color: #008080;"> 1</span> #include<stdio.h>
<span style="color: #008080;"> 2</span> <span style="color: #008000;">//</span><span style="color: #008000;">求最大</span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;">int</span> max(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">return</span> x>y?<span style="color: #000000;">x:y;
</span><span style="color: #008080;"> 5</span> <span style="color: #000000;">}
</span><span style="color: #008080;"> 6</span> <span style="color: #008000;">//</span><span style="color: #008000;">求最小</span>
<span style="color: #008080;"> 7</span> <span style="color: #0000ff;">int</span> min(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">return</span> x<y?<span style="color: #000000;">x:y;
</span><span style="color: #008080;"> 9</span> <span style="color: #000000;">}
</span><span style="color: #008080;">10</span> <span style="color: #008000;">//</span><span style="color: #008000;">求和</span>
<span style="color: #008080;">11</span> <span style="color: #0000ff;">int</span> add(<span style="color: #0000ff;">int</span> x,<span style="color: #0000ff;">int</span><span style="color: #000000;"> y){
</span><span style="color: #008080;">12</span> <span style="color: #0000ff;">return</span> x+<span style="color: #000000;">y;
</span><span style="color: #008080;">13</span> <span style="color: #000000;">}
</span><span style="color: #008080;">14</span>
<span style="color: #008080;">15</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> main(){
</span><span style="color: #008080;">16</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> a,b;
</span><span style="color: #008080;">17</span> <span style="color: #0000ff;">int</span> (*process)(<span style="color: #0000ff;">int</span>, <span style="color: #0000ff;">int</span><span style="color: #000000;">);
</span><span style="color: #008080;">18</span>
<span style="color: #008080;">19</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">Please input a and b:\n</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">20</span> scanf(<span style="color: #800000;">"</span><span style="color: #800000;">%d %d</span><span style="color: #800000;">"</span>, &a, &<span style="color: #000000;">b);
</span><span style="color: #008080;">21</span>
<span style="color: #008080;">22</span> process=<span style="color: #000000;">max;
</span><span style="color: #008080;">23</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">max=%d\n</span><span style="color: #800000;">"</span><span style="color: #000000;">,process(a,b));
</span><span style="color: #008080;">24</span>
<span style="color: #008080;">25</span> process=<span style="color: #000000;">min;
</span><span style="color: #008080;">26</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">min=%d\n</span><span style="color: #800000;">"</span><span style="color: #000000;">,process(a,b));
</span><span style="color: #008080;">27</span>
<span style="color: #008080;">28</span> process=<span style="color: #000000;">add;
</span><span style="color: #008080;">29</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">sum=%d\n</span><span style="color: #800000;">"</span><span style="color: #000000;">,process(a,b));
</span><span style="color: #008080;">30</span> }</pre>
</div>
<p>结果为：</p>
<p><img src="https://images2018.cnblogs.com/blog/1027447/201803/1027447-20180317193335715-1334227962.png" alt="" /></p>
<p> </p>