编辑“︁C++ 字符串搜索”︁（章节）

=== 案例2：文本处理 ===

在文本中查找并统计某个单词的出现次数：

<syntaxhighlight lang="cpp">
#include <iostream>
#include <string>

int countOccurrences(const std::string& text, const std::string& word) {
    int count = 0;
    size_t pos = 0;
    while ((pos = text.find(word, pos)) != std::string::npos) {
        count++;
        pos += word.length();
    }
    return count;
}

int main() {
    std::string text = "C++ is a powerful language. C++ is widely used.";
    std::string word = "C++";

    int occurrences = countOccurrences(text, word);
    std::cout << "The word \"" << word << "\" appears " << occurrences << " times." << std::endl;

    return 0;
}
</syntaxhighlight>

输出：
<pre>
The word "C++" appears 2 times.
</pre>