15
The statement PRINT 10 + 5
adds 10
to 5
and then prints the result
15
on the monitor.
Here is what you see on your computer's screen when you
run this program:
Don't get lost in the details. The part that the program printed is the number "15". All the other stuff is unimportant and depends on what computer you are using.
Here is the program again:
PRINT 10 + 5 END
The last statement, END signals the end of the program. It is obvious where this program ends, but it is harder to tell with longer programs, so the END statement is necessary for them.
Do you suppose that the following program is correct?
END PRINT 10 + 5