Question

How to print a map in C++

Answer 1

#include <iostream>
#include <map>
#include <string>

using std::cout;
using std::endl;
using std::map;
using std::string;

int main()
{
	map<int, string> mp = { { 14, "c" },{ 23, "c++" },{ 32, "java" },{88, "python"} };
	
	map<int, string>::iterator it;
	for (it = mp.begin(); it != mp.end(); it++) {
		cout << "key: " << it->first << " value: " << it->second << endl;
	}

	return 0;
}

/*
run:

key: 14 value: c
key: 23 value: c++
key: 32 value: java
key: 88 value: python

*/

 

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Answer 2

#include <iostream>
#include <map>
#include <string>

using std::cout;
using std::endl;
using std::map;
using std::string;

int main()
{
	map<int, string> mp = { { 14, "c" },{ 23, "c++" },{ 32, "java" },{88, "python"} };

	for (auto it = mp.cbegin(); it != mp.cend(); it++) {
		cout << "key: " << it->first << " value: " << it->second << endl;
	}

	return 0;
}

/*
run:

key: 14 value: c
key: 23 value: c++
key: 32 value: java
key: 88 value: python

*/

 

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Answer 3

#include <iostream>
#include <map>
#include <string>

using std::cout;
using std::endl;
using std::map;
using std::string;

int main()
{
	map<int, string> mp = { { 14, "c" },{ 23, "c++" },{ 32, "java" },{88, "python"} };

	for (auto elem : mp) {
		cout << "key: " << elem.first << " value: " << elem.second << endl;
	}

	return 0;
}

/*
run:

key: 14 value: c
key: 23 value: c++
key: 32 value: java
key: 88 value: python

*/

 

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