运行下面的代码，将出现（ ）。
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;
}
- A. 屏幕上输出 Caught: Runtime error occurred.
- B. 屏幕上输出 Caught an unknown exception.
- C. 程序调用 std::terminate()
- D. 编译错误
正确答案：A