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#include<iostream>
#include<string>
#include<fstream>
#include<algorithm>
#include<iomanip>
using namespace std;
struct Display
{
string words;;
int count;
};
struct Node
{
Display value;
Node* pLeft;
Node* pRight;
};
Node* add(Node* tree, Display value);
Node* addNode(Node* tree, Node* toAdd);
bool treeContains(Node* tree, string word) ;
void displayAlphabetTree(Node* tree);
void main()
{
Display value;
string choiceStr;
char choice;
bool eofReached = false;
value.count = 0;
Node* tree = 0;
string txtFile;
cout << "Enter filename: ";
cin >> txtFile;
cout << endl;
ifstream read(txtFile.c_str());
if(!read)
{
cout << "Error, can't open file" << endl;
exit(1);
}
else
{
while(!read.eof())
{
read >> value.words;
eofReached = read.eof();
if (treeContains(tree, value.words) == false)
{
tree = add(tree, value);
}
}
}
read.close();
do
{
cout << " a - display alphabetic list" << endl;
cout << " f - display frequency ordered list" << endl;
cout << " s - display statistics" << endl;
cout << " x - exit" << endl;
cout << endl;
cout << "Enter choice: ";
cin >> choiceStr;
choice = choiceStr.length() == 0 ? choice = 'e' : choice = choiceStr[0];
switch(choice)
{
case 'a':
case 'A':
displayAlphabetTree(tree);
break;
case 'x':
case 'X':
break;
default:
cout << "Error, invalid choice";
break;
}
}
while(choice != 'x');
}
Node* add(Node* tree, Display value)
{
//tempPtr is a temporary pointer
Node* tempPtr = new Node;
tempPtr->value = value;
tempPtr->pLeft = 0;
tempPtr->pRight = 0;
return addNode(tree, tempPtr);
}
Node* addNode(Node* tree, Node* toAdd)
{
if (tree == 0)
{
return toAdd;
}
else
{
if(toAdd->value.words < tree->value.words)
{
tree->pLeft = addNode(tree->pLeft, toAdd);
return tree;
}
else if(toAdd->value.words == tree->value.words)
{
tree->value.count++;
return tree;
}
else
{
tree->pRight = addNode(tree->pRight, toAdd);
return tree;
}
}
}
bool treeContains(Node* tree, string word)
{
// If a word is in the binary
// tree then true is returned.
// Vice versia, false is returned if not.
if (tree == NULL)
{
// Tree is empty, so it certainly doesn't contain item.
return false;
}
else if (word == tree->value.words)
{
//The word matches to one in the root node.
return true;
}
else if (word < tree->value.words)
{
// The word is less than the one in the root node
// and must be sent to the left subtree.
return treeContains(tree->pLeft, word);
}
else
{
// The word is more than the one in the root node
// and must be sent to the right subtree.
return treeContains(tree->pRight, word);
}
}
void displayAlphabetTree(Node* tree)
{
if(tree != 0)
{
displayAlphabetTree(tree->pLeft);
displayAlphabetTree(tree->pRight);
cout<<tree->value.words<<" "<<"["<<tree->value.count<<"]"<<endl;
}
}
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