simple structure – adding complex objects by input – class definition recap 9/9

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 15 Class Definition Drill 9

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 15 Class Definition Drill 9

#include "std_lib_facilities.h"

struct Person
{
Person(string first_name, string second_name, int age);
Person() {}

const string first_name() { return first_n; }
const string second_name() { return second_n; }
const int age() { return a; }

void set_first_name(string first_name);
void set_second_name(string second_name);
void set_age(int age);

private:
string first_n;
string second_n;
int a;
};

Person::Person(string first_name, string second_name, int age)
{
for (char l : first_name) {
if (!isalpha(l)) { error("first_name contains invalid character: ", first_name); }
}
for (char l : second_name) {
if (!isalpha(l)) { error("second_name contains invalid character: ", second_name); }
}
if (age > 150 || age < 0) { error("age is not valid", age); }

first_n = first_name;
second_n = second_name;
a = age;
}

void Person::set_first_name(string first_name)
{
for (char l : first_name) {
if (!isalpha(l)) { error("name contains invalid character: ", first_name); }
}
first_n = first_name;
}

void Person::set_second_name(string second_name)
{
for (char l : second_name) {
if (!isalpha(l)) { error("name contains invalid character: ", second_name); }
}
second_n = second_name;
}

void Person::set_age(int age)
{
if (age > 150 || age < 0) { error("age is not valid", age); }
a = age;
}

istream& operator>>(istream& is, Person& p) {
string first_name;
string second_name;
int second_name_check;
int age;

is >> first_name;
is >> second_name;
for (char l : second_name) {
if (!isalpha(l)) { error("there was no second name provided: ", second_name); }
}
is >> age;

for (char l : first_name) {
if (!isalpha(l)) { error("first_name contains invalid character: ", first_name); }
}
for (char l : second_name) {
if (!isalpha(l)) { error("second_name contains invalid character: ", second_name); }
}
if (age > 150 || age < 0) { error("age is not valid", age); }

p.set_first_name(first_name);
p.set_second_name(second_name);
p.set_age(age);

return is;
}

ostream& operator<<(ostream& os, Person& p) {
os << "Name: " << p.first_name() << ", " << p.second_name() << " Age: " << p.age();
return os;
}

int main()
try
{
Person p1;
vector<Person> ppl;

char check;

while (true) {
cin >> check;
if (check == ‘x’) {
break;
}
else {
cin.putback(check);
cin >> p1;
ppl.push_back(p1);
}
}

for (Person p : ppl) {
cout << p << endl;
}

keep_window_open();
}
catch (exception& e) {
cerr << "error: " << e.what() << ‘\n’;
keep_window_open();
return 1;
}

catch (…) {
cerr << "Unknown exception!\n";
keep_window_open();
return 2;
}
[/code]

Input:
Hans Peter 23
Phil Schneider 34
x

Output:
Name: Hans, Peter Age: 23
Name: Phil, Schneider Age: 34
Please enter a character to exit