Problem in building tree

#1

unable to build tree… kindly help

#2 
node *buildtree()
{
    string d;
    cin>>d;
    if(d=="false")
        return NULL;
	else if(d=="true")
	{
		int a;
		cin>>a;
		node *root = new node(a);
        root->left = buildtree();
        root->right = buildtree();
        return root;
	}
	else
    {
		stringstream geek(d);
		int x = 0;
        geek >> x;
		node *root = new node(x);
        root->left = buildtree();
        root->right = buildtree();
        return root;
	}
}

Just call this function.

#3

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