C++ using command line to take text files names as argument and display contents.

The contents of 1.txt are:

apple

banna

orange

The contents of 2.txt are:

987

654

321

Running the program in command line should give the following output:

$ ./program 1.txt 2.txt

apple

banna

orange

987

654

321

example with non-existing file 3.txt

: $ ./program 1.txt 2.txt 3.txt

apple

banna

orange

987

654

321

Invalid file: 3.txt