main.cpp


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#include <iostream>

int add_one(int x);

int main() {
	std::cout << "hello world\n";
	int* x = nullptr;
	int y = 2;
	x = &y;
	std::cout << *x << '\n';
	auto z = add_one(*x);
	std::cout << z << '\n';
	return *x;
}