When we open a file for input or output in our program, list two reasons why is it important to close it when we are done? In C++

Good day.  Please help C++ How can I read these numbers from an input file. I want to store each number as an integer  E.g for the first line  I want to store 1 as n And 6 as m, the “–” makes it difficult.  Please assist

INTRODUCTION: In this assignment, you will demonstrate how to write simple programs that get input from the user, produce output, perform simple calculations, make decisions, perform iteration/repetition, and create enumeration types. HOW TO SUBMIT YOUR ASSIGNMENT At the top of each of your C++ programs, you should have at least four lines of documentation: Program name (the C++ file name(s)), Author (your name), Date last updated, and Purpose (a brief description of what the program accomplishes). Here is an example: /* Program name: jbtictactoe.cpp * Author: John Doe * Date last updated: 5/1/2017 * Purpose: Play the game of Tic-Tac-Toe ASSIGNMENT: Movie Data Create a program that uses a structure named MovieData to store the following information about a movie: • Title . Genre . Director • Year Released . Running time (in minutes) Write a program that prompts the user for input and allows all of these member data values to be specified. The program should create two MovieData…

Discuss the two different ways that a file may be opened inside of a C++ application. When might one approach be more appropriate than the other?