What is the differences between begin(),end() and cbegin() ,cend()? [duplicate]

Question

Although when we traversing through begin(),end() and cbegin(),cend(). They gives us same result.But what is the difference between them?

#include<iostream>
#include<map>
using namespace std;
int main()
{
    map<char,int>mp;
    mp['a']=200;
    mp['b'] = 100;
    mp['c']=300;
    for(auto it =mp.cbegin();it!=mp.cend();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }
cout<<endl;
     for(auto it =mp.begin();it!=mp.end();it++)
    {
        cout<<it->first<<" "<<it->second<<endl;
    }

    return 0;
}

Answer 1

cbegin: Returns a const_iterator pointing to the first element in the container.
begin: Returns an iterator pointing to the first element in the sequence.
cend: Returns a const_iterator pointing to the past-the-end element in the container.
end: Returns an iterator pointing to the past-the-end element in the sequence.

http://www.cplusplus.com/reference/map/map/cbegin/ http://www.cplusplus.com/reference/iterator/begin/?kw=begin http://www.cplusplus.com/reference/map/map/cend/ http://www.cplusplus.com/reference/iterator/end/?kw=end

Answer 2

There are two differences, which are very much related.

The first difference is that cbegin has no overloads, and it is const qualified, while begin is overloaded by two functions one of which is const qualified and the other is not.

The second difference is in the type of the iterator that they return. As per documentation, cbegin returns a const_iterator, while one overload of begin return iterator and the other returns const_iterator (like cbegin).