Given the following inclusions and type definitions:

#include

structbtnode_int;

typedefstructbtnode_int *btnode;

structbtnode_int

{

btnode left;

int *data;

btnode right;

};

structbinary_search_tree_int;

typedefstructbinary_search_tree_int *bst;

structbinary_search_tree_int

{

btnode root;

};

And the following function definition:

int f1(bstt,intv)

{

btnode c =t->root;

int n = 0;

while (c !=NULL)

{

if ((*(t->data))

{

n++;

c = c->left;

}

else

{

c =NULL;

}

}

return n;

}

1. What does the functionf1() do?

2. What possible situation(s) could cause the code to fail, i.e. crash?