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The function of toupper function in C language

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Release: 2024-05-02 18:30:56
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toupper函数将小写字母转换为大写字母。它遍历字符串中的字符,将 ASCII 码值减去 32 以将小写字母转换为大写字母。

The function of toupper function in C language

toupper函数的作用

toupper函数是C语言中一个字符串操作函数,它的作用是将给定字符串中的小写字母转换为大写字母。

工作原理

toupper函数通过以下步骤实现其功能:

  • 遍历字符串中的每个字符。
  • 如果字符是小写字母,则将其ASCII码值减去32。这一过程将字符转换为等效的大写字母。
  • 如果字符不是小写字母,则保持原样。

语法

<code class="c">int toupper(int c);</code>
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其中:

  • c:要转换的字符。

返回值

toupper函数返回转换后的字符。如果输入字符不是小写字母,则返回原样。

示例

<code class="c">char str[] = "hello world";
for (int i = 0; str[i] != '\0'; i++) {
    str[i] = toupper(str[i]);
}
printf("%s\n", str); // 输出:HELLO WORLD</code>
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注意

toupper函数只转换ASCII字符集中的小写字母。它不会影响非ASCII字符或大写字母。

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