C++ Map Create Question

Introduction

Write a program that defines a map where keys are of type char and values are of type int.

Print out the map content.

You can use the following code structure: 

#include <iostream> 

int main() 
{ 

} 



#include <iostream> 
#include <map> 

int main() 
{ 
    std::map<char, int> mymap = { {'a', 1}, {'b', 5}, {'e', 10}, {'f', 10}  
}; 
    for (auto el : mymap) 
    { 
        std::cout << el.first << ' ' << el.second << '\n'; 
    } 
}

Map elements are key-value pairs.

These pairs are represented by an std::pair class template which can store a pair.

So the type of a map element is std::pair<char, int>.

In a map container, keys are unique, and values do not have to be unique.

We initialize the map with our key-value pairs inside the initializer list {}.

Using a ranged-based for loop, we iterate over map elements.

To access the key in a pair, we use the pair's .first member function, which represents the first element in a pair, in our case - the key.

Similarly, we access the second element using the pair's .second member function, which represents the map element value.




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