Find the minimum data value find in Binary Search tree (using cpp)

Given a non-empty binary search tree (an ordered binary tree), return the minimum data value found in that tree. Note that it is not necessary to search the entire tree. A maxValue() function is structurally very similar to this function. This can be solved with recursion or with a simple while loop. int minValue(struct node* node) {

/*
 Given a non-empty binary search tree,
 return the minimum data value found in that tree.
 Note that the entire tree does not need to be searched.
*/
int minValue(struct node* node) {
  struct node* current = node;   // loop down to find the leftmost leaf
  while (current->left != NULL) {
    current = current->left;
  }
  return(current->data);
}