simple structure – adding objects by input – class definition recap 8/9

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 15 Class Definition Drill 8

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 15 Class Definition Drill 8

#include "std_lib_facilities.h"

struct Person
{
Person(string name, int age);
Person() {}

const string name() { return n; }
const int age() { return a; }

void set_name(string name);
void set_age(int age);

private:
string n;
int a;
};

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

n = name;
a = age;
}

void Person::set_name(string name)
{
for (char l : name) {
if (!isalpha(l)) { error("name contains invalid character: ", name); }
}
n = 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 name;
int age;

is >> name >> age;

p.set_name(name);
p.set_age(age);

return is;
}

ostream& operator<<(ostream& os, Person& p) {
os << "Name: " << p.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:
Phil 28
Jasmin 30
Benjamin 22
x

Output:
Name: Phil Age: 28
Name: Jasmin Age: 30
Name: Benjamin Age: 22
Please enter a character to exit