binary.trees/binary.tree.c
void postorder(Node* root) {
    if (root) {
        postorder(root->leftChild);
        postorder(root->rightChild);
        printf("%4d", root->data);
    }
}
/**
 * postorder: prints the tree with the postorder method (see explaination)
 * @param root the root of the tree
*/
prints the tree with the postorder method
@param root the root of the tree
prints the tree with the postorder method @param root the root of the tree
void postorder(Node* root) {
    if (root) {
        postorder(root->leftChild);
        postorder(root->rightChild);
        printf("%4d", root->data);
    }
}
void postorder ( Node * root ) { if ( root ) { postorder ( root -> leftChild ) ; postorder ( root -> rightChild ) ; printf ( " " , root -> data ) ; } }
postorder: prints the tree with the postorder method (see explaination)
 @param root the root of the tree
postorder : prints the tree with the postorder method ( see explaination ) @param root the root of the tree