编辑“︁C++map”︁（章节）

== 实际应用案例 ==
=== 单词统计 ===
<syntaxhighlight lang="cpp">
#include <iostream>
#include <map>
#include <string>

int main() {
    std::map<std::string, int> wordCount;
    std::string word;
    
    while (std::cin >> word) {
        ++wordCount[word];  // 自动初始化不存在的键为0
    }
    
    // 输出统计结果（按字母顺序）
    for (const auto& pair : wordCount) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }
    
    return 0;
}
</syntaxhighlight>

输入：
<pre>
apple banana apple cherry banana apple
</pre>

输出：
<pre>
apple: 3
banana: 2
cherry: 1
</pre>

=== 学生成绩管理系统 ===
<syntaxhighlight lang="cpp">
#include <iostream>
#include <map>
#include <string>

class Student {
public:
    std::string name;
    int score;
    
    Student(std::string n, int s) : name(n), score(s) {}
};

int main() {
    std::map<int, Student> studentMap;
    
    // 添加学生（学号为键）
    studentMap.insert({1001, Student("Alice", 95)});
    studentMap[1002] = Student("Bob", 88);
    studentMap[1003] = Student("Charlie", 92);
    
    // 查询学生成绩
    int id = 1002;
    auto it = studentMap.find(id);
    if (it != studentMap.end()) {
        std::cout << "Student " << it->second.name 
                  << " (ID: " << it->first 
                  << ") has score: " << it->second.score << std::endl;
    } else {
        std::cout << "Student not found!" << std::endl;
    }
    
    return 0;
}
</syntaxhighlight>

输出：
<pre>
Student Bob (ID: 1002) has score: 88
</pre>