Please write in C++. Please look at the example and the example output. IntroductionIn this lab you will practice using basic input/output, structs, and arrays of structs. Be sure to read this lab thoroughly, especiallythe Hand-in ProcedureLabTo start your lab you will need a struct to read data into. The struct definition should be placed above main () and belowusing namespace std. The struct should be called PurchaseType and contain the following fields:1. string customerID2. string productNamedouble price3.4. int qtyPurchased5. double taxRateWrite a complete program that:1.Uses a user defined function:void openFile(ifstream& iFile, string prompt)Which gets the name of a file from the user and opens it into iFile by:a. Prompting the user for a filename using prompt and reading the filename into a string.b. Opening the file name obtained in (1a) into iFile, and verifying that it opened. If the file does not open theprogram should output an error message and continue from (1a) until a valid file name is entered. See theexample output for error formatting.i.The file contains strings, integers, and doubles with 5 values per line with 10 lines of data in the file.Each line of data represents a different item purchased by a customer.2. Creates an array of instances of the PurchaseType struct to hold the data from the file obtained in (1).3. Uses a user defined function:void readFile(ifstream& iFile, PurchaseType purchases[])Which reads the data from iFile into purchases by:iFile contains rows of data which correspond to the elements of the PurchaseType struct. Iterate throughiFile inserting the rows of data, using str.find () str.substr(), into purchases until eof is hit.а.4. Uses a user defined function:void printPurchaseData (PurchaseType purchases [], int size)Which prints the data contained in purchases by:a. Using iomanip to nicely output all the data in a tabular format. You will need to calculate the total price foreach product purchased by multiplying the price of each product by the quantity purchased, and thenmultiplying by the (tax rate + 1). See the example output for formatting.b. Keeping track of each total found and outputting the average total at the end of the table.c. Keeping track of the count of unique customers and outputting the total unique customers at the end of thetable.main () should only contain variable declarations and function calls (to your user-defined functions). All data must be readinto an array of PurchaseType structs first, then the required output. You must write all of the functions in this lab, failing todo so will result in you receiving a 0 for this lab. Failure to use an array of structs will also result in a 0 for this lab. Seethe example output for examples and formatting.Prototypes for your user defined functions are:1. void openFile (ifstream&, string);2. void readFile(ifstream&, PurchaseType[]);3. void printPurchaseData (PurchaseType[], int); Example 3Alexs-iMac:labllb alex$ g++ -Wall -pedantic -Werror main.cppAlexs-iMac:lab11b alex$ ./a.outEnter file name**wrongError: Invalid FileEnter file name**incorrect.csvError: Invalid FileEnter file name**invalid.txtError: Invalid FileEnter file name**errError: Invalid FileEnter file name**purchases1.csv| Customer ID | Product Name | Price | Quantity | Tax Rate | Totalshirt | 10.00 |pants | 15.95 |jacket | 24.49 |blouse | 19.99 |A134CX2 I1 |2 11 |1 |1 |3 |8.25 |10.82 |A134CX2 |8.25 |34.53 |A134CX2 |8.25 |26.51 |4J3712I |8.25 |21.64 |pants | 14.98 |mittens I4J37121 |8.25 |16.22 |4J37121 |9.99 |8.25 |32.44 |4J3712I |socks | 10.98 |3 |35.66 |8.25 |7.15 |B834621 |gloves |9.99 |2 |21.41 |cap | 24.99 |earrings | 49.99 |B834621 |3 |7.15 |80.33 |27G8ZZY I1 |8.25 |54.11 |Unique users:Average total: $33.374

Question

Accepted Answer

program.cpp
#include <iostream> //header file to display to user and read from user…

Prototypes for your user defined functions are: 1. void openFile (ifstream&, string); 2. void readFile (ifstream&, PurchaseType[]); 3. void printPurchaseData (PurchaseType [], int);