I\'m having trouble with sorting. I have to find the product most sold and least

Question

I'm having trouble with sorting. I have to find the product most sold and least sold using the sort function. for some reason it is not working. I need help. I have provided my code and the txt file. the code runs, but the sorting part doesn't do it right.

I also have to find the item that generated the most income. Please help me thanks

#include<iostream>
#include<fstream>
#include<cmath>
#include<iomanip>
#include<string>

using namespace std;
const int SIZE = 100;

void readFile(string & date, int amount_sold[], float price[], string item_name[], int & numLines, char & c);
void totalSales(int amount_sold[], float price[], string item_name[], int & numLines, float & sum);
void sort(int listLength, int amount_sold[], float price[], string item_name[], bool(*compare)(int, int));
void displayToFile(string date,int listLength, int amount_sold[], float price[], string item_name[], int numLines, float sum);

int main()
{
   int listLength =0;
   int amount_sold[SIZE];
   float price[SIZE];
   string item_name[SIZE];
   string date;
   char c;
   float sum = 0;
   int numLines = 0;
   int *compare;

   readFile(date, amount_sold, price, item_name, numLines, c);
   totalSales(amount_sold, price, item_name, numLines, sum);
   displayToFile(date, listLength, amount_sold, price, item_name, numLines, sum);

       return 0;
}

// function to read file
void readFile(string & date, int amount_sold[], float price[], string item_name[], int & numLines, char & c)
{
   ifstream infile;
   infile.open("sales.txt");

   cout << "Sales on " << endl;

   //if statement if file can't be found
   if (!infile)
   {
       cout << "Error, file couldn't be found";
       cout << endl;
       exit(1);
   }

   getline(infile, date);
   cout << date << endl;

   // while loop to display the list of sales
   while (!infile.eof() && numLines < SIZE)
   {

       infile >> amount_sold[numLines] >> c >> price[numLines];
       getline(infile, item_name[numLines]);
       cout << endl;
       cout << amount_sold[numLines] << " " << c << price[numLines] << " " << item_name[numLines];
       ++numLines;
   }
   cout << endl << endl;
}

// function to calculate the sales of the day
void totalSales(int amount_sold[], float price[], string item_name[], int & numLines, float & sum)
{

   //total sales of the day
   for (int i = 0; i < numLines; ++i)
   {
       sum += (amount_sold[i]) * (price[i]);
   }
   cout << "Total sales: " << sum;
   cout << endl << endl;

}

// function to sort
void sort(int listLength, int amount_sold[], float price[], string item_name[], bool(*compare)(int, int))
{
   int temp;
   string temp2;

   //sorting to find product most sold
   for (int i = 0; i < listLength-1; i++)
   {
       for (int j = i+1; j < listLength; j++)
       {
           if ((*compare) (amount_sold[i], amount_sold[j]));
           {
               //swap amount
               temp = amount_sold[i];
               amount_sold[i] = amount_sold[j];
               amount_sold[j] = temp;
               //swap price
               temp = price[i];
               price[i] = price[j];
               price[j] = temp;
               //swap item name
               temp2 = item_name[i];
               item_name[i] = item_name[j];
               item_name[j] = temp2;
           }
       }
   }

}

// function to display information to report.txt file
void displayToFile(string date, int listLength, int amount_sold[], float price[], string item_name[], int numLines, float sum)
{

   ofstream outfile;
   outfile.open("report.txt");

   outfile << "Sales on: " << date << endl << endl;

   //output total sales
   outfile << "Total sales: " << sum;
   cout << endl;
   outfile << endl << endl;

   //output product most sold and least sold
   outfile << "Most sold: " << *item_name;
   outfile << endl;
   cout << "Most sold: " << *item_name;
   cout << endl;
   outfile << "Least sold: " << *item_name;
   outfile << endl << endl;
   cout << "Least sold: " << *item_name;
   cout << endl << endl;

   outfile.close();

}

//==========================================================================

txt file

February 12, 2015
57 $1.80 Premium Milk
30 $2.00 Berrytale
25 $3.50 Boroh Danish
15 $1.89 Marble Taro
65 $2.54 Chocolate Chip Bowl
44 $1.45 Mango Bread
53 $3.15 Coffee Raisin Bread
32 $2.00 Milk Pudding
20 $1.50 Red Bean Bread
34 $2.15 Cheese Bread
49 $3.75 Brioche

Explanation / Answer

#include<iostream>
#include<fstream>
#include<cmath>
#include<iomanip>
#include<string>
using namespace std;
const int SIZE = 100;
void readFile(string & date, int amount_sold[], float price[], string item_name[], int & numLines, char & c);
void totalSales(int amount_sold[], float price[], string item_name[], int & numLines, float & sum);
void sort(int listLength, int amount_sold[], float price[], string item_name[]);
void displayToFile(string date,int listLength, int amount_sold[], float price[], string item_name[], int numLines, float sum);
int main()
{
int listLength =0;
int amount_sold[SIZE];
float price[SIZE];
string item_name[SIZE];
string date;
char c;
float sum = 0;
int numLines = 0;
int *compare;
listLength=numLines;
readFile(date, amount_sold, price, item_name, numLines, c);
totalSales(amount_sold, price, item_name, numLines, sum);
sort(numLines,amount_sold,price,item_name);
cout<<"number of entries: "<<numLines<<endl;
for (int i = 0; i < numLines; i++){
cout << amount_sold[i] << " " << c << price[i] << " " << item_name[i]<<endl;
}
displayToFile(date, listLength, amount_sold, price, item_name, numLines, sum);

return 0;
}
// function to read file
void readFile(string & date, int amount_sold[], float price[], string item_name[], int & numLines, char & c)
{
ifstream infile;
infile.open("sales.txt");
cout << "Sales on " << endl;

//if statement if file can't be found
if (!infile)
{
cout << "Error, file couldn't be found";
cout << endl;
  
}
getline(infile, date);
cout << date << endl;
// while loop to display the list of sales
while (!infile.eof() && numLines < SIZE)
{
infile >> amount_sold[numLines] >> c >> price[numLines];
getline(infile, item_name[numLines]);
cout << endl;
cout << amount_sold[numLines] << " " << c << price[numLines] << " " << item_name[numLines];
++numLines;
}
cout << endl << endl;
}
// function to calculate the sales of the day
void totalSales(int amount_sold[], float price[], string item_name[], int & numLines, float & sum)
{
//total sales of the day
for (int i = 0; i < numLines; ++i)
{
sum += (amount_sold[i]) * (price[i]);
}
cout << "Total sales: " << sum;
cout << endl << endl;
}
// function to sort
void sort(int numLines, int amount_sold[], float price[], string item_name[])
{
int temp;
float temp3;
string temp2;
//sorting to find product most sold
for (int i = 0; i < numLines; ++i){
for (int j = 0; j < numLines - i - 1; ++j)
if (amount_sold[j] < amount_sold[j + 1])
{
//swap amount
temp = amount_sold[j];
amount_sold[j] = amount_sold[j+1];
amount_sold[j+1] = temp;
//swap price
temp3 = price[j];
price[j] = price[j+1];
price[j+1] = temp3;
//swap item name
temp2 = item_name[j];
item_name[j] = item_name[j+1];
item_name[j+1] = temp2;
}
}

}
// function to display information to report.txt file
void displayToFile(string date, int listLength, int amount_sold[], float price[], string item_name[], int numLines, float sum)
{
ofstream outfile;
outfile.open("report.txt");
outfile << "Sales on: " << date << endl << endl;
//output total sales
outfile << "Total sales: " << sum;
cout << endl;
outfile << endl << endl;
//output product most sold and least sold
outfile << "Most sold: " << *item_name;
outfile << endl;
cout << "Most sold: " << *item_name;
cout << endl;
outfile << "Least sold: " << *item_name;
outfile << endl << endl;
cout << "Least sold: " << item_name[numLines-1];
cout << endl << endl;

outfile.close();

}

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