C++ How can I convert a double to a string with fixed point notation so it only

Question

C++ How can I convert a double to a string with fixed point notation so it only shows 2 digits after the decimal?

Here's my code:

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

using namespace std;

static const int NUM_ROWS = 15;
static const int NUM_SEATS = 30;
char SeatStructures[NUM_ROWS][NUM_SEATS];
double cost;
double price[NUM_ROWS];
int rowRequested,
seatNumber;

string PrintTicket(int row, int seat, double cost);

int main()
{
   ifstream SeatPrices;

   SeatPrices.open("SeatPrices.dat");
   if (!SeatPrices)
       cout << "Error opening SeatPrices data file. ";
   else
   {
       for (int rows = 0; rows < NUM_ROWS; rows++)
       {
           SeatPrices >> price[rows];
           cout << fixed << showpoint << setprecision(2);
           //cout << endl << "Row " << (rows + 1) << ": ";
           //cout << "$" << price[rows];
       }
       cout << endl << endl;
   }
   SeatPrices.close();

   cout << "In which row would you like to find seats(1 - 15)? ";
   cin >> rowRequested;
   cout << "What is your desired seat number in the row (1 - 30)? ";
   cin >> seatNumber;

   cout << PrintTicket(rowRequested, seatNumber, cost);

   return 0;
}

string PrintTicket(int row, int seat, double cost)
{
       return
       string(" **************************************** Theater Ticket Row: ") +
       to_string(row) +
       string(" Seat: ") +
       to_string(seat) +
       string(" Price: $") +
       to_string(price[rowRequested - 1]) +
       string(" **************************************** ");
}

Data from text file:

12.50
12.50
12.50
12.50
10.00
10.00
10.00
10.00
8.00
8.00
8.00
8.00
5.00
5.00
5.00

Explanation / Answer

You can use below function.

boost::format("0.2%s") % {variable-name};

You can directly use it with cout.

cout << and above function.

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