Description: This method is used to return a constant iterator pointing to the past-the-end element in the container Example
#include <iostream>
#include <set>
int main(){
std::set<int> myset = {50,20,60,10,25};
std::cout<<"myset contains: ";
for(auto i = myset.cbegin(); i != myset.cend(); i++)
std::cout<<' '<< *i;
std::cout<<'\n';
return 0;
}