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47 lines
1.1 KiB
HTML
47 lines
1.1 KiB
HTML
<h1>字符串函数 - memcmp</h1>
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<p>原型：extern int memcmp(void *buf1, void *buf2, unsigned int count);</p>
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<p>用法：#include <string.h></p>
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<p>功能：比较内存区域buf1和buf2的前count个字节。</p>
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<p>说明：</p>
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<pre><code class="language-c">
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当buf1<buf2时，返回值<0
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当buf1=buf2时，返回值=0
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当buf1>buf2时，返回值>0
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</code></pre>
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举例：<pre><code class="language-c">
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// memcmp.c
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#include <syslib.h>
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#include <string.h>
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main()
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{
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char *s1="Hello, Programmers!";
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char *s2="Hello, programmers!";
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int r;
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clrscr();
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r=memcmp(s1,s2,strlen(s1));
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if(!r)
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printf("s1 and s2 are identical");
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else
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if(r<0)
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printf("s1 less than s2");
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else
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printf("s1 greater than s2");
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getchar();
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return 0;
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}
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</code></pre>相关函数：<a href="memicmp.html">memicmp</a>,<a href="strcmp.html">strcmp</a>
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