Write a program that reads the contents of a text file. The program should then create a structure that has 3 fields: a word, the frequency of the word, the list of line numbers where the word appears. Then the program will open a text file and read the content of the file. It will create another text file as output file. The output file should contain an alphabetical listing of the words, their frequency, and the list of line numbers where the word appears. -g

See explaination

Explanation:

#include <iostream>

#include <fstream>

#include <string>

#include <vector>

#include <map>

#include <sstream>

using namespace std;

// structure to hold the word, frequency and list of lines in which word appears

struct wordFrequency

{

string word;

int frequency;

vector<int> lineNumber;

};

// main method

int main()

{

// input file name. You can change the input file name if your file name is different

string inputFileName = "data.txt";

// creating a map class object to hold words uniquely

map<string, wordFrequency> map_word;

// ifstream class object to open and read from file

ifstream fin(inputFileName);

// validating if file is opened or not

if (!fin.is_open())

{

cout << "Error in opening file!";

exit(1);

}

// string to hold line from file

string line;

// int variable to keep track of line number

int lineNumber = 0;

// fetching lines from file

while (getline(fin, line))

{

// increasing the lineNumber count because we fetch another line

++lineNumber;

// breaking a line into words using stringstream class object

string word;

stringstream iss(line);

// iterating over all the words in a line

while (iss >> word)

{

// if the word is not in the map then we create and add a new pair

auto it = map_word.find(word);

if (it == map_word.end())

{

// creating a new struct object to store new word

wordFrequency w;

w.word = word;

w.frequency = 1;

w.lineNumber.push_back(lineNumber);

map_word.insert({word, w});

}

else

{

// if the word is already there then incresing frequency and push line number into list

it->second.frequency += 1;

it->second.lineNumber.push_back(lineNumber);

}

}

}

// closing the input file

fin.close();

// creating a new output file

ofstream fout("WordFrequency.txt");

if (fout.is_open())

{

// iterating over a map

for (auto word : map_word)

{

// writing data to a output file

fout << "Word is : " << word.second.word << endl;

fout << "Frequency is : " << word.second.frequency << endl;

fout << "Appears in line : ";

for (auto i : word.second.lineNumber)

{

fout << i << " ";

}

fout << endl

<< endl;

}

// closing output file

fout.close();

}

else

{

cout << "Error! Not able to create output file!";

}

}