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/************************************************************
 
    Following is the Binary Tree node structure
 
    class BinaryTreeNode 
    {
        public : 
        T data;
        BinaryTreeNode<T> *left;
        BinaryTreeNode<T> *right;
 
        BinaryTreeNode(T data) 
        {
            this -> data = data;
            left = NULL;
            right = NULL;
        }
    };
 
************************************************************/
void lefthelper(BinaryTreeNode<int> *root, int level, int &maxlevel){
    if(root == NULL){
        return;
    }
    if(maxlevel<level){
        cout<<root->data<<" ";
        maxlevel = level;
    }
    lefthelper(root->left,level+1,maxlevel);
    lefthelper(root->right,level+1,maxlevel);
 
}
void printLeftView(BinaryTreeNode<int> *root)
{
    //Write your code here
    if(root == NULL){
        return;
    }
    int maxlevel = -1;
    lefthelper(root,1,maxlevel);
}

prog.cpp:21:17: error: variable or field ‘lefthelper’ declared void
 void lefthelper(BinaryTreeNode<int> *root, int level, int &maxlevel){
                 ^~~~~~~~~~~~~~
prog.cpp:21:17: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:21:32: error: expected primary-expression before ‘int’
 void lefthelper(BinaryTreeNode<int> *root, int level, int &maxlevel){
                                ^~~
prog.cpp:21:44: error: expected primary-expression before ‘int’
 void lefthelper(BinaryTreeNode<int> *root, int level, int &maxlevel){
                                            ^~~
prog.cpp:21:55: error: expected primary-expression before ‘int’
 void lefthelper(BinaryTreeNode<int> *root, int level, int &maxlevel){
                                                       ^~~
prog.cpp:33:20: error: variable or field ‘printLeftView’ declared void
 void printLeftView(BinaryTreeNode<int> *root)
                    ^~~~~~~~~~~~~~
prog.cpp:33:20: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:33:35: error: expected primary-expression before ‘int’
 void printLeftView(BinaryTreeNode<int> *root)
                                   ^~~

Standard output is empty