According to the C++23 standard, what is the output of this program?
#include <iostream>
struct X {
X() { std::cout << "X"; }
};
int main() { X x(); }What is the difference between X x; and X x();?
This program has no output.
X x(); is a function prototype, not a variable definition. Remove the parentheses (or since C++11, replace them with {}), and the program will output X.