Let the user input integers and stop when input is 0, print out the second biggest number(excluding 0)

[Bubiche]

I have come up with the code below but I don't know if I have covered all the cases, please help me with that. Also if you think you have a better solution then share it please (⊙ω⊙)

 #include <iostream>
using namespace std;

int main()
{
	int n,max=0,max2=0,temp;
	n=1;

	while(n!=0)
	{
		if (max == 0)
			max = n;
		if (max2 == 0)
			max2 = n;
		if (n>max)
		{
			temp = max;
			max = n;
			max2 = temp;
		}
		cout<<"Input a number, or input 0 to stop: ";
		cin>>n;
	}
	if (max == max2)
		cout<<"ERROR"<<endl;
	else
		cout<<"Second biggest: "<<max2<<endl;

	system("pause");
	return 0;
}

Thank you