How many times is the function recursive_dec_to_bin() called when the following code is executed?

[answerhappygod]

#include<stdio.h>
int arr[31], len = 0;
void recursive_dec_to_bin(int n)
{
if(n == 0 && len == 0)
{
arr[len++] = 0;
return;
}
if(n == 0)
return;
arr[len++] = n % 2;
recursive_dec_to_bin(n/2);
}
int main()
{
int n = 111,i;
recursive_dec_to_bin(n);
for(i=len-1; i>=0; i--)
printf("%d",arr);
return 0;
}
a) 7
b) 8
c) 9
d) 10