Question Mark in a Box when using println

Question

When running this in a command prompt,

System.out.println(Num + " is prime!");
System.out.println("Press N to put in another number or S to stop");

Where Num is an int

This is what comes out:

This is what comes out

Is there any way to counter it or should I just deal with it?

Looks like an **encoding** issue to me. what is `Num`? Is it an `int` or rather a `String`? Where does it come from? — Zabuzard, Nov 18 '17 at 02:11
Usually you get this when trying to print out Unicode characters, what is the type of `Num`? — luckydog32, Nov 18 '17 at 02:20

Robert I · Answer 1 · 2017-11-18T02:15:33.713

1

System.out.println(String.valueOf(Num) + " is prime!");

Edit: Adding more information to replete the mystery here.

java.lang.String.valueOf will correctly parse your Number where as simply adding a Number with a String will vary between compilers.

edited Nov 18 '17 at 02:15

answered Nov 18 '17 at 02:05

Robert I

1

Where's the `?` coming from and why does this fix it? – John Kugelman Nov 18 '17 at 02:07
"...simply adding a Number with a String will vary between compilers." -- Say what? No, it won't. – John Kugelman Nov 21 '17 at 00:18

1 Answers1