example.cpp

#include <iostream>
#include <cstdlib>
#include <stdexcept>

bool is_admin = false;

void set_admin(int uid) {
	is_admin = 0 == uid;
}

int sum_of_squares(int a, int b) {
	int a2 = a * a;
	int b2 = b * b;
	return a2+b2;
}

int main(int argc, const char *argv[]) {

    std::cout << "Starting example program\n";

    try {
        if(argc != 3) {
            throw std::out_of_range("Supply two arguments, please");
        }
        int a = std::atoi(argv[1]);
        int b = std::atoi(argv[2]);

        if(a == b  && b == 5) {
            throw std::runtime_error("Lucky number 5");
        }

        set_admin(sum_of_squares(a, b));

        std::cout << "You are " << (is_admin ? "now" : "not") << " admin.\n";
    } catch(std::out_of_range& e) {
        std::cerr << "Index out of range: " << e.what() << std::endl;
        return 1;
    } catch(std::runtime_error& e) {
        std::cerr << "Runtime error: " << e.what() << std::endl;
        return 1;
    } catch (...) {
        std::cerr << "An unknown exception occurred!\n";
        return 1;
    }

    return 0;
}