c++ - Vector, iterators and const_iterator -

i have started learning vectors , iterators. can't understand 2 things. why can change constant iterator , role of "*"?

#include <iostream> #include <string> #include <vector> using namespace std; int main() {     vector<string> inventory;     inventory.push_back("inventory1");     inventory.push_back("inventory2");     inventory.push_back("inventory3");     vector<string>::iterator myiterator;     vector<string>::const_iterator iter;     cout << "your items:\n";     (iter = inventory.begin(); iter != inventory.end(); iter++)     {         cout << *iter << endl;     } 

when iter = inventory.begin() makes iter refer first string in vector. iter++ moves refer next string.

in output use *iter way access string iter refers to. in first output inventory1.

the slight confusion constness

vector<string>::const_iterator   iter; 

is iterator refers things constant, while

const vector<string>::iterator   iter; 

would make iterator constant, allow modify object refers to.