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//my .h file
 
#ifndef __TRIE_H__
#define __TRIE_H__
#include <string>
#include <cctype>
 
struct TrieNode {
  enum { Apostrophe = 26, NumChars = 27 };
  bool isWord;
  char letter;
  TrieNode *letters[NumChars];
  TrieNode() {
    isWord = false;
    letter = '/0';
    for ( int i = 0; i < NumChars; i += 1 ) {
      letters[i] = NULL;
    } // for
  }
}; // TrieNode
 
void insert( TrieNode &node, const std::string &word );
 
 
 
#endif
 
//my .cpp file
 
#include <iostream>
#include <string>
#include "trie.h"
 
void insert( TrieNode &node, const std::string &word )
  {
    int x = 0;
    while (word[x] != '\0'){
      int c = word[x] - 'a';
      if ( node.letter[c] == NULL ){
        TrieNode *n = new TrieNode();
        n->letter = word[i];
        n->isWord = false;
        for(int i=0;i<26;i++)
          {
            n->letters[i] = NULL;
          }
        node.letters[c] = n;
        node = n;
      }
      else { node = node.letters[c]; }
      x++;
    }
    node.isWord = true;
  }
 
// my driver
#include <iostream>
#include <iomanip>
#include "trie.h"
 
using namespace std;
 
 
int main()
{
  TrieNode x; string line;
  cin >> line;
  insert(&x,&line);
  cout << x.letters[1]->letter;
  return 0;
}

prog.cpp:15:14: warning: multi-character character constant
prog.cpp:32:18: error: trie.h: No such file or directory
prog.cpp: In constructor ‘TrieNode::TrieNode()’:
prog.cpp:15: warning: overflow in implicit constant conversion
prog.cpp: In function ‘void insert(TrieNode&, const std::string&)’:
prog.cpp:39: error: invalid types ‘char[int]’ for array subscript
prog.cpp:41: error: ‘i’ was not declared in this scope
prog.cpp:48: error: no match for ‘operator=’ in ‘node = n’
prog.cpp:8: note: candidates are: TrieNode& TrieNode::operator=(const TrieNode&)
prog.cpp:50: error: no match for ‘operator=’ in ‘node = node->TrieNode::letters[c]’
prog.cpp:8: note: candidates are: TrieNode& TrieNode::operator=(const TrieNode&)
prog.cpp: In function ‘int main()’:
prog.cpp:68: error: invalid initialization of non-const reference of type ‘TrieNode&’ from a temporary of type ‘TrieNode*’
prog.cpp:34: error: in passing argument 1 of ‘void insert(TrieNode&, const std::string&)’

Standard output is empty