Tree: Preorder Traversal

Problem Statement

You are given a pointer to the root of a binary tree; print the values in preorder traversal.

You only have to complete the function.

Input Format 
You are given a function,

void Preorder(node *root) {

}

Output Format 
Print the values on a single line separated by space.

Sample Input

     3
   /   \
  5     2
 / \    /
1   4  6

Sample Output

3 5 1 4 2 6

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/* you only have to complete the function given below.  
Node is defined as  

struct node
{
    int data;
    node* left;
    node* right;
};

*/

void Preorder(node *root) {
    if(root == NULL){
        return;
    }
    cout<<root->data<<" ";
    Preorder(root->left);
    Preorder(root->right);
}