Ask the user for two filenames. The first filename specifies the input file and the second filename specifies the output file. You can assume the filenames do not contain any whitespace characters.



Your objective is to sort all the triangles represented in the input file in ascending order based on their area sizes and output the sorted list of triangles to the output file following the same file format. Among all the triangles with the same area size, sort them in ascending order according to their IDs.



You must use Triangle objects in your program to represent the triangles you read from the file.



If your program fails to open a file, it should display an error message and terminate immediately.

-Ask the user for two filenames. The first filename specifies the input file and the second filename specifies the output file. You can assume the filenames do not contain any whitespace characters. Your objective is to sort all the triangles represented in the input file in ascending order based on their area sizes and output the sorted list of triangles to the output file following the same file format. Among all the triangles with the same area size, sort them in ascending order according to their IDs. You must use Triangle objects in your program to represent the triangles you read from the file. If your program fails to open a file, it should display an error message and terminate immediately.