이름중복: 가능하지만 비추천

#include <iostream>
using namespace std;

int fn(int a) {
	int main = a + 1;
	int cout = a - 1;
	return main * cout;
}
int main() {
	cout << fn(5) << endl;			// 24
	int main = 2;
	int cout = 7;
	::cout << main * cout << endl;	// 14
}