#include <iostream>
using namespace std;

void func1(int a) {
    a += 10;
}
void func2(int &a) {
    a += 10;
}
void func3(int *a) {
    *a += 10;
}

int main() {
    int x = 10;
    func1(x);
    cout << x << " ";
    func2(x);
    cout << x << " ";
    func3(&x);
    cout << x << endl;
    return 0;
}