$1.$ Open the file book inventory.txt for input. If the file was not opened successfully, display an

appropriate error message. For example,

ifstream infile;

infile.open$($book inventory.txt$)$;

if $($infile$.$fail$())$ cout $<<$Error opening file...

$$;

$2.$ Use a while loop to read each book from book inventory.txt until the end of file is reached.

$3.$ For each book, calculate the retail value $($retail price $*$ quantity$).$

$4.$ Write data records for each book to the file inventory report.txt$.$ Your inventory report.txt file

should look similar to the one shown in the figure below.

$5.$ Display the total retail value for all books at the bottom of inventory report.txt$.$