C++ program that uses command line arguments

Write a program that will implement command line options. Example will follow.

The first option will obviously be the program. The second option (if present, will be something like -d, or -s, etc). The third option will be a keyword that will need to be used further in the program. Fourth option will be an input file name that the user inputs. Fifth option will be an output file for the text to go to.

Example: This is an example with the second option present: ./test -d YOLO input.txt output.txt

This is an example without the second option present: ./test YOLO input.txt output.txt