Question

Write a program that lists the distinct words in a file in alphabetical order in c++

Answer 1

C++ program to print unique words in a file

Write a function that takes a file name as argument and prints all unique words in it.

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The idea is to use map in STL to keep track of words already occurred.



// C++ program to print unique words in a string
#include <bits/stdc++.h>

using namespace std;


// Prints unique words in a file

void printUniquedWords(char filename[])
{

// Open a file stream

fstream fs(filename);



// Create a map to store count of all words

map<string, int> mp;



// Keep reading words while there are words to read

string word;

while (fs >> word)

{

// If this is first occurrence of word

if (!mp.count(word))

mp.insert(make_pair(word, 1));

else

mp[word]++;

}



fs.close();



// Traverse map and print all words whose count

//is 1

for (map<string, int> :: iterator p = mp.begin();

p != mp.end(); p++)

{

if (p->second == 1)

cout << p->first << endl;

}
}


// Driver program

int main()
{

// Create a file for testing and write something in it

char filename[] = "test.txt";

ofstream fs(filename, ios::trunc);

fs << "geeks for geeks quiz code geeks practice for qa";

fs.close();



printUniquedWords(filename);

return 0;
}

Output:

code
practice
qa
quiz
Thanks to Utkarsh for suggesting above code.

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