example1_basic_usage.cpp

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<std::string, int> ageMap;

    // Insertion
    ageMap["Alice"] = 30;
    ageMap["Bob"] = 25;
    ageMap["Charlie"] = 35;

    // Accessing elements
    std::cout << "Alice's age: " << ageMap["Alice"] << std::endl;

    // Lookup
    if (ageMap.find("Bob") != ageMap.end()) {
        std::cout << "Bob is in the map." << std::endl;
    }

    // Deletion
    ageMap.erase("Charlie");

    // Iterating over the map
    std::cout << "People in ageMap:" << std::endl;
    for (const auto& pair : ageMap) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}