Write a function calcPastries which takes a parameter, a file name, as a string. Your function should read each line from the given filename, parse and process the data, and print the required information. Once the file has been read, your function should print the total pay from all lines. Your function should return the number of entries read from the file. Empty lines do not count as entries. If the input file cannot be opened, return -1 and do not print anything.

//main.cpp

#include<iostream>

#include<fstream>

#include<sstream>

#include<string>

using namespace std;

//function prototypes

int calcPastries(string filename);

int split(string s, char sep, string words[], int max_words);

//start of main function

int main()

{

  //Set file name

  string fname="inputfile.txt";

  //call function, calcPastries

  calcPastries(fname);

  system("pause");

  return 0;

}

/*The function, calcPastries thta takes a string file name and then read the file and split the line of text using

split function. The method prints the data of the file on console */

int calcPastries(string fname)

{

  //Open file for reading

  ifstream fin;

  fin.open(fname);

  //check if file not exists

  if(!fin)

  {

      cout<<"File Not Found."<<endl;

      return -1;

  }

  double total=0;

  int lineCount=0;

  string words[3];

  int max_words=3;

  string linetext;

  /*read file ,find to end of file */

  while(!fin.eof())

  {

      getline(fin,linetext,'\n');

      //call the split function

      split(linetext, ',',words,max_words );

      //print the data to console

      cout<< words[0]<<":"<<stof(words[1])*stof(words[2])<<endl;

      /*Convert string to float and then multiply then add to total*/

      total+=stof(words[1])*stof(words[2]);

      //increment the linecount by 1

      lineCount++;

  }

  //print total value on console

  cout<<"Total :"<<total<<endl;

  return lineCount;

}

/*The split function takes a string ,delimiter , arrary of string type and maxwords to split and then split the string and store the tokens into the string,word array and then print the data to console.*/

int split(string s, char sep, string words[], int max_words)

{

  char delimiter=sep;

  std::string token;

  std::istringstream tokenStream(s);

  int counter=0;

  while(getline(tokenStream, token, ','))

  {

      words[counter]=token;

      counter++;

  }

  return counter;

}

Explanation: