cont1.cpp

#include<iostream>
#include<vector>

using namespace std;

struct Entry {
        string name;
        int number;
};

ostream& operator<<(ostream &os, const Entry &e)
{
        return os<<"{\""<<e.name<<"\", "<<e.number<<"}";
}

void print_book(const vector<Entry>& book)
{
        for (const auto& x:book) {
                cout <<x<<"\n";
        }
}

int main()
{
        vector<Entry> phone_book = {
                {"David Hume", 123456},
                {"Karl Popper", 234567},
                {"Bertrand Arthur William Russell", 345678}
        };
        print_book(phone_book);
        return 0;
}