Write program using a map with keys and values. Create a program that reads the contents of a text file lists the amount of times a word appears in the text file. Sample given code is below.

#include

#include

#include

#include

#include

#include

using namespace std;

void split (const string &, char, vector &);

bool openFile(ifstream &);

bool buildMap(map> &);

void writeIndex(map>);

string trim(string &);

int main ()

{

map > wordMap;

if (buildMap(wordMap))

{

cout << "The map has " << wordMap.size() << "elements. ";

writeIndex(wordMap);

}

return 0;

}

// The buildMap function opens a file and builds the word map.

bool buildMap(map> &wordMap)

{

ifstream inputFile; // The input file

string line; // To hold a line from the file

int lineCount = 0; // To hold the line numbers

vector tokens; // To hold tokens

// Open the file.

bool status = openFile(inputFile);

// If the file was successfully opened...

if (status)

{

// Get the first line from the file.

getline(inputFile, line);

// While we're not at the end of the file...

while (inputFile)

{

// Update the line counter.

lineCount++;

// Clear previous tokens.

tokens.clear();

// Split the line into tokens.

split(line, ' ', tokens);

// Create elements from the tokens.

for (auto element : tokens)

{

// Create an empty set.

set mySet;

// Emplace the new element.

wordMap.emplace(element, mySet);

// Add the current line number to the element's set.

wordMap[element].insert(lineCount);

}

// Get the next line from the file.

getline(inputFile, line);

}

// Close the input file.

inputFile.close();

}

return status;

}