运行以下C++代码，程序的运行结果是什么？
double hmean(double a, double b) {
if (a == -b)
throw runtime_error("Runtime error occurred.");
return 2.0 * a * b / (a + b);
}
int main() {
double x = 10;
double y = -10;
try {
int result = hmean(x, y);
cout << "hmean: " << result << endl;
}
catch (const runtime_error& e) {
cout << "Caught: " << e.what() << endl;
} catch (...) {
cout << "Caught an unknown exception." << endl;
}
return 0;
}
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