C++. how do you make an output file also? or is an output file automatically created?

Description In this assignment, you are to take in input from two files: one file containing a list of five first names and one file containing a list of five last names. Using this input, you are to generate output file listing the full names as "FirstName LastName" with each full name being displayed on a new line as shown in the example files below. The first name will be on the same line number as the corresponding last name. Input Files: firstNames.txt lastNames.txt