The following text was written to the standard output stream when the NumberArray program was executed from IntelliJ.
>>> display 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >>> print first 1 >>> print last 15 >>> print 3 3 >>> swap 5 7 >>> display 1 2 3 4 7 6 5 8 9 10 11 12 13 14 15 >>> help HELP - display a menu of command DISPLAY - display the list of numbers PRINT - print a number (FIRST;LAST;nth) SWAP - exchange two elements (nth;mth) ADD - add a number to the list (FIRST;LAST) EXIT - terminate execution of the program >>> add 100 ### invalid operand for add command >>> add first 100 >>> add last 100 >>> display 100 1 2 3 4 7 6 5 8 9 10 11 12 13 14 15 0 100 >>>