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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
typedef struct node {
int id;
struct node *left;
struct node *right;
} treenode;
int countNodes(t)
treenode *t;
{
int i = 0;
if(!t) return 0;
return 1 + countNodes(t->left) + countNodes(t->right);
}
main (argc, argv, envp)
int argc;
char **argv, **envp;
{
treenode *t;
t = malloc(sizeof(treenode));
/* build a binary tree with at least 6 nodes */
t->right = malloc(sizeof(treenode));
t->left = malloc(sizeof(treenode));
t->right->right = malloc(sizeof(treenode));
t->right->left = malloc(sizeof(treenode));
t->left->right = malloc(sizeof(treenode));
t->left->left = malloc(sizeof(treenode));
t->right->right->right = 0;
t->right->right->left = 0;
t->right->left->right = 0;
t->right->left->left = 0;
t->left->right->right = 0;
t->left->right->left = 0;
t->left->left->right = 0;
t->left->left->left = 0;
printf("the tree has %d nodes\n", countNodes(t));
}
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