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36 lines
845 B
HTML
36 lines
845 B
HTML
<h1>字符函数 - isupper</h1>
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<p>原型：extern int isupper(int c);</p>
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<p>用法：#include <ctype.h></p>
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<p>功能：判断字符c是否为大写英文字母</p>
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<p>说明：当c为大写英文字母(A-Z)时，返回非零值，否则返回零。</p>
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举例：<pre><code class="language-c">
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// isupper.c
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#include <syslib.h>
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#include <ctype.h>
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main()
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{
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int c;
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clrscr(); // clear screen
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c='a';
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printf("%c:%s\n",c,isupper(c)?"yes":"no");
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c='A';
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printf("%c:%s\n",c,isupper(c)?"yes":"no");
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c='7';
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printf("%c:%s\n",c,isupper(c)?"yes":"no");
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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="islower.html">islower</a>
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