Why is this code bringing 1as the output??

Question

#include <iostream>
using namespace std;

int main()
{
int a;
a=1;
do {
cout << a << endl;
cin>> a;
a++;
} while(a <= 9);

return 0;
}

Answer 1

Because you have initialized a=1 therefore it's displaying 1 and waiting for getting next input

Answer 2

I tried to only declare 'a' and input a value >9 and the output was 0.