Answer:
the output of the above program is
2 3
3 5
8
Step-by-step explanation:
It seems the program is trying to pair two numbers into one and leaving the unpaired number (in a case of odd number of numbers) as a separate output.
This is why numbers 2 and 3 form 23, numbers 3 and 5 form 35 and 8 is another output of the program.