Question

How to create and use unordered_map container for string and double in C++

Answer 1

#include <iostream>
#include <unordered_map>
#include <string>

int main()
{
	std::unordered_map<std::string, double> u_map{ { "ccc", 3.14 }, 
	                                               { "bbbbb", 2.78 }, 
												   { "aa", 1.99 } };

	for (std::pair<const std::string, double>& elem : u_map) {
		elem.second *= 1.3;
	}

	for (const auto& elem : u_map) {
		std::cout << elem.first << ": " << elem.second << std::endl;
	}

	return 0;
}

/*
run:

ccc: 4.082
bbbbb: 3.614
aa: 2.587

*/

 

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