Search:

/*maybe buggy.!! but try this */

int product_of_evens(int i)
{
if (i<=0)
return 1;
if((i%2)==0)
return i*(product_of_evens(i-1));
else...

/*maybe buggy.!! but try this */

int product_of_evens(int i)
{
if (i<=0)
return 1;
if((i%2)==0)
return i*(product_of_evens(i-1));
else...