Question

How to iterate over map keys and values in C++

Answer 1

#include <map>
#include <iostream>

int main() {
    std::map<const char*, int> mp;
  
    mp["c"] = 1;
    mp["cpp"] = 2;
    mp["java"] = 3;
    mp["csharp"] = 4;
  
    for (const auto& [key, value]: mp) {
	    std::cout << "Key: " << key << " Value: " << value << '\n';
    }
}



/*
run:

Key: c Value: 1
Key: cpp Value: 2
Key: java Value: 3
Key: csharp Value: 4

*/

 

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Answer 2

#include <map>
#include <iostream>

int main() {
    std::map<const char*, int> mp;
  
    mp["c"] = 1;
    mp["cpp"] = 2;
    mp["java"] = 3;
    mp["csharp"] = 4;
  
    for (const auto& keyvalue: mp) {
	    std::cout << "Key: " << keyvalue.first << " Value: " << keyvalue.second << "\n";
    }
}



/*
run:

Key: c Value: 1
Key: cpp Value: 2
Key: java Value: 3
Key: csharp Value: 4

*/

 

Learn SQL from A to Z at LearnSQL.com