C++ coding- Follow the instructions

/*===========================================================

Program Name- Reading from and writing to file Program Description- This program demonstrates how to read from and write to file. It reads a name list from a file, sort the list and then writes the sorted list to another file.

Instructions- 1. Imitate the output sample, its prompts and output, as closely as you can. 2. You must define the declared function writeNamesToFile(..). 3. When you complete #2, test your code in the main(). 4. Add your code where it says "Write your code below...". Do NOT change or remove any existing statements.

Note- For sorting, you are required to use the library function. =========================================================== */ #include #include #include #include #include #include

using namespace std;

/** For every name in vector string A, put last name, first name. */ void lastNameFirstPlusComma(vector &A);

// Prints out vector string A void printStringVector(const vector &A);

// Reads names into vector "names" from the file "in". void readNamesFromFile(vector &names, ifstream& in);

/* =========================================== You must define the following function after main(). <<< Write your code below... >>> =========================================== */

// Writes names in vector "names" to the file "out" void writeNamesToFile(const vector &names, ofstream& out);

int main() { cout << "=================================================== "; cout << "This program reads a name list from a file, sorts the list and "; cout << "then writes the sorted list to another file. "; cout << "=================================================== ";

string inFile, outFile; // for input/output file name. ifstream inF; // for input file stream. ofstream outF; // for output file stream.

cout << "Enter the file name of the name list ==> "; cin >> inFile; inF.open(inFile.c_str()); if (inF.fail()) { cout << "Error opening " << inFile << "! "; return 1; }

vector nameList; readNamesFromFile(nameList, inF); inF.close();

cout << " This is the original name list in the file..."; cout << " ___________________ "; printStringVector(nameList);

cout << " ==> Put the last name first..."; lastNameFirstPlusComma(nameList);

cout << " ___________________ "; printStringVector(nameList);

/* ============================================ You must sort the above nameList and then write it to a file, whose name should be input from the user. <<<<<< Write your code below... >>>>> ============================================ */ cout << endl;

return 0; }

//======================================= void lastNameFirstPlusComma(vector &A) { string s1, s2;

for (size_t i = 0; i < A.size(); i++) { istringstream input(A[i]); input >> s1 >> s2; A[i] = s2 + ", " + s1; } }

void readNamesFromFile(vector &names, ifstream& in) { string name;

getline(in, name); while (!in.fail()) { names.push_back(name); getline(in, name); }; }

void printStringVector(const vector &A) { for (size_t i = 0; i < A.size(); i++) cout << A[i] << endl; }

/* Output sample

===================================================== This program reads a name list from a file, sorts the list and then writes the sorted list to another file. =====================================================

Enter the file name of the name list ==> 5_names.txt

The original name list in the file... ___________________ Jane Doe Maggie Walter John Stone Carol Adams Kevin Engles

==> Put last name, first name... ___________________ Doe, Jane Walter, Maggie Stone, John Adams, Carol Engles, Kevin

==> Sorting the name list...

Enter the file name for the sorted list ==> output.txt Check the sorted name list in the file output.txt!

*/