exception.cpp
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	#include <cmath>
	#include <iostream>
	#include <string>

	struct Exception {
	Exception(const std::string &mesg) : mesg(mesg){};

	const std::string &what() { return mesg; };

	std::string mesg;
	};

	double mysqrt(double x) {
	if (x < 0) {
	throw Exception("no negative number sqrt");
	}
	return std::sqrt(x);
	}

	int main(int argc, char **argv) {

	try {
	double res = mysqrt(-1);
	std::cout << res << std::endl;
	} catch (Exception &e) {
	std::cout << e.what() << std::endl;
	}
	}