Define the phrase "header file" in your own words

Write a code in c++ to open a file called romania.txt for appending, only for a relevant code. You may assign any file object

Analyze the problems carefully. Create the programs of the following. 1. Ages and Stages (Fle name: Age_Lastname) Create a program that checks as to which stage an age is. Use the table below. Age 5-12 years Stage Grade-schooler 13-17 years Теen 18-21 years Young adult 2. LRT-2 Single Journey Fare Matrix (File name: LRT_Lastname) Create a program that displays the fare based on the entered destination. The starting station is Araneta-Cubao. Use the table below. Use the code destination to shorten the user's input. Destination Fare Recto (Re) J. Ruiz (Jr) Gilmore (Gi) PHP 20 PHP 15 PHP 10

Write a C++ program that asks the user for a file name and a word for which to search.  The program should search the file for every occurrence of the word.  When the word is found, the line it contains should be displayed.  After all of the occurrences have been found, the program should display the number of times the word was found in the file.

Programming Language: C++ 6. Separate compilation was useful in older programming languages, but having multiple files adds an unnecessary layer of complexity and is discouraged in modern programming languages. = true or false?