How do you design a PhoneCall class in c plus plus that holds a phone number to which a call is placed with length of the call in minutes and the rate charged per minute using overload extraction?

Answer 1

Overload extraction is a meaningless term. However you don't need overloaded functions for this.

class PhoneCall {

std::string _phone_no;

unsigned _duration; // in minutes

double _rpm; // rate per minute

public:

PhoneCall (std::string, unsigned, double); PhoneCall (const PhoneCall&) = default;

PhoneCall (PhoneCall&&) = default;

PhoneCall& operator= (const PhoneCall&) = default;

PhoneCall& operator= (PhoneCall&&) = default;

~PhoneCall (void) = default;

};

PhoneCall::PhoneCall (const std::string& phone_no, const unsigned duration, const double rpm):

_phone_no {phone_no}, _duration {duration}, _rpm {rpm}

{}

Usage:

std::vector<PhoneCall> calls;

v.push_back ({"01315554284", 6, 0.10}); // 6-minute call at 10p per minute

v.push_back ({"01315554292", 5, 0.15}); // 5-minute call at 15p per minute