习题6.4

int countleaves (BiTree T){if (T != NULL){if (T ->lchild != NULL && T -> rchild != NULL){return (countleaves(T ->lchild) + countleaves(T -> rchild) ) ;}else{if (T -> lchild != NULL){return countleaves(T -> lchild) ;}if (T -> rchild != NULL){return countleaves(T -> rchild) ;}return 1 ;}}else return 0 ;}