```
unsigned int getLeafCount(struct node* node)
{
if(node == NULL)
return 0;
if(node->left == NULL && node->right==NULL)
return 1;
else
return getLeafCount(node->left)+
getLeafCount(node->right);
}
```

Now subtract it from total number of nodes so same function will serve two purpose count leaf nodes or count non leaf node.