Passing an array into a function

Question

void func(int x[], int y) {
x[0] = 0;
y=0;
}
int main () {
int x [] = {7}, y=8;
func (x, y);
cout << x[0] << y;
}

// The output is 08

Why is the output not 78?
After all, there is not return statement in the void function.

Even so, how come only the y value is NOT returned?