5

#include<iostream>
#include<vector>

using namespace std;

class exc : public exception {
public:
	const char* what() const noexcept {
		return " Error :: Parameter of class must be positive";
	}
};

class IsPositive {
	int a;
public:
	IsPositive(int a);
};

// Parameter of class can be positive only
IsPositive::IsPositive(int a) {
	a > 0 ? this->a = a : throw exc();
	cout << " Number = " << a << endl;
}

void main() {
	vector<int> V;

	// out_of_range
	try {
		V.at(1);
	}
	catch (exception& e) {
		cout << " Out of range :: " << e.what() << endl;
	};

	// lenght_error
	try {
		V.reserve(V.max_size() + 1);
	}
	catch (exception& e) {
		cout << " Length error :: " << e.what() << endl;
	};

	// withOUT error
	try {
		IsPositive a = 5;
	}
	catch (exception& e) {
		cout << e.what() << endl;
	}

	// with error
	try {
		IsPositive a = -5;
	}
	catch (exception& e) {
		cout << e.what() << endl;
	}
	cout << system("pause");
}