exercise8_13.cpp

#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
#include <cctype>

using std::vector; using std::string; using std::cin; using std::istringstream;
using std::ostringstream; using std::ifstream; using std::cerr; using std::cout; using std::endl;

struct PersonInfo
{
	string name;
	vector<string> phones;
};

bool valid(const string& str)
{
	return isdigit(str[0]);
}

string format(const string& str)
{
	return str.substr(0, 3) + "-" + str.substr(3, 3) + "-" + str.substr(6);
}

int main()
{
	ifstream ifs("E:/code/cpp_primer_answer/Cpp_Primer_Answers/data/phonenumbers.txt");
	if (!ifs)
	{
		cerr << "no phone numbers?" << endl;
		return -1;
	}

	string line, word;
	vector<PersonInfo> people;
	istringstream record;
	while (getline(ifs, line))
	{
		PersonInfo info;
		record.clear();
		record.str(line);
		record >> info.name;
		while (record >> word)
			info.phones.push_back(word);
		people.push_back(info);
	}

	for (const auto &entry : people)
	{
		ostringstream formatted, badNums;
		for (const auto &nums : entry.phones)
		if (!valid(nums)) badNums << " " << nums;
		else formatted << " " << format(nums);
		if (badNums.str().empty())
			cout << entry.name << " " << formatted.str() << endl;
		else
			cerr << "input error: " << entry.name
			<< " invalid number(s) " << badNums.str() << endl;
	}

	return 0;
}