Write the function readSalesData. #include #include #include #include #include using namespace std; // structure definition struct Sales {     string name;     int amount; }; // function prototypes double detCommissionPercent(int sales); double detAmountEarned(int sales); Sales* readSalesData(string filename, int& noPeople); int calculateTotal(Sales* list, int noPeople); void showSalesData(Sales* list, int noPeople, int total); void saveSalesData(string filename, Sales* list, int noPeople, int total); int main() {     // pointer to be used to dynamically allocate an array of Sales structures     Sales *list;              // other variables     int noPeople;           // number of sales people     string filename;        // input file name      int total;          // function calls     cout << "Enter input file name: "; // without extension     cin >> filename;     filename += ".txt";     // call readSalesData      ifstream inFile;          //Open the file     inFile.open(filename.c_str());          //Test for file open errors     if (!inFile)     {         cout << "Error opening the input file: " << filename << "." << endl;         exit (101);     }//if          inFile >> noPeople;          //Display error when number of salesperson is 0 or negaative     if (noPeople <= 0) {             cout << "The array size is invalid." << endl;             cout << "The program ends here!" << endl;             return 0;     }     else {            list = new Sales[noPeople];            readSalesData (filename, noPeople);             }                   // call calculateTotal     total = calculateTotal (list, noPeople);          string answer;     cout << "\nShow Report(Y/N)? ";     cin >> answer;     if (answer == "y" || answer == "Y") {         // call showSalesData         showSalesData (list, noPeople, total);     }          // call saveSalesData     saveSalesData (filename, list, noPeople, total);          delete [] list;          return 0; } /* Write your code here. For each function definition write a short comment too, as demonstrated in previous assignments */ /*~*~*~*~*~*~  This function determines the commision percent based on the following table:     Sales        Commission    $0 - 1000        3%  1001 - 5000        4.5%  5001 - 10,000      5.25%  over 10,000        6% *~*/ double detCommissionPercent(int sales) {     double commission = 0;     /*Write your code here */     if (sales <= 1000) {         commission = 3;     }     else if (sales <= 5000) {         commission = 4.5;     }     else if (sales <= 10000) {         commission = 5.25;     }     else {         commission = 6;     }          return commission; } /*~*~*~*~*~*~  This function determines the amount earned:  it calls the detCommisionPercent) function. *~*/ double detAmountEarned(int sales) {     double amountEarned = 0;     /* Write your code here */     amountEarned = detCommissionPercent(sales) * sales / 100.0;          return amountEarned; } ///////////////////////////////////// //Calculate all data and add to the total int calculateTotal(Sales *list, int noPeople) {     int total = 0;     for(int i = 0; i < noPeople; i++) {         total += list[i].amount;     }          return total; }//calculateTotal ///////////////////////////////////// //Read the sales data from file and store it in an array of structures Sales* readSalesData(string filename, int& noPeople) {     }//readSalesData /////////////////////////////////////////// /*Display the amount sold, names, comission percent, and amount earned for each person on screen. It also shows the total amount earned by all sales persons.*/ void showSalesData(Sales* list, int noPeople, int total) {     cout << "ABC Company Report" << endl;     for(int i = 0; i < noPeople; i++)     {         cout << "$";         cout << right << setw(6) << list[i].amount;         cout << " " << list[i].name << ",";         cout << fixed << setprecision(2) << " " << detCommissionPercent(list[i].amount);         cout << "% ($" << detAmountEarned(list[i].amount) << ")" << endl;     }     cout << "Total Sales: $" << total << endl; }//showSalesData ///////////////////////////////////////////// //Save data void saveSalesData(string filename, Sales* list, int noPeople, int total) {     string out_file_name = "";     for(int i = 0; filename[i]; i++)     {         if(filename[i] == '.')             break;         out_file_name += filename[i];     }     out_file_name += "_report.txt";     ofstream fout(out_file_name);     fout << "ABC Company Report" << endl;     for(int i = 0; i < noPeople; i++)     {         fout << "$";         fout << right << setw(6) << list[i].amount;         fout << " " << list[i].name << ",";         fout << fixed << setprecision(2) << " " << detCommissionPercent(list[i].amount) << "%";         fout << " ($" << detAmountEarned(list[i].amount) << ")" << endl;     }     fout << "Total Sales: $" << total;     cout << "The Sales Report has been saved to \"" << out_file_name << "\"" << endl; }