What does >+ and >- mean in C#

Question

I had accidentally tried this, which compiles! So I was wondering what could this possibly mean.. google didnt help..

if (3 >+ 4)
   dothis() //this is never hit btw..

if (3 >- 4)
   dothis() //this is hit.

Both the code compile btw..

Oh very stupid of me. thanks guys. Can I close the question? — nawfal, Mar 31 '12 at 12:38
Btw. did you know the goes to operator `i --> 0` and the comes from operator `0 <-- i`? http://stackoverflow.com/questions/1642028/what-is-the-name-of-this-operator — CodesInChaos, Mar 31 '12 at 12:38
No reason to downvote this into oblivion. The question is clear and has code that exhibits the problem. While the answer may be obvious, sometimes one has a bit of a brainfart. The `-->` question is a bit cooler, but essentially the same thing, and it got hundreds of upvotes. — CodesInChaos, Mar 31 '12 at 12:43
@CodeInChaos: agreed; the question is perfectly legit. Hopefully the next guy who runs into this can simply Google for it. — Martin Törnwall, Mar 31 '12 at 12:55

jason · Accepted Answer · 2012-03-31T15:47:10.973

10

It parses as

3 > +4

and

3 > -4

So into the unary + and unary - operators.

If you want an interesting way to explore this, write

Expression<Func<int, int, bool>> func = (x, y) => x >+ y;

and then explore the resulting expression tree func in the debugger. You'll see the unary operator in the tree.

edited Mar 31 '12 at 15:47

answered Mar 31 '12 at 12:35

jason

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score 2 · Answer 2 · answered Mar 31 '12 at 12:37

Is 3 greater than 4?

Is 3 greather than -4?

If you're ever in doubt about what something is doing, write a little test app:

  int i = +3;
  int j = -4;

  Console.WriteLine(i);
  Console.WriteLine(j);

  Console.WriteLine((3 > +4));
  Console.WriteLine((3 > -4));

score 2 · Answer 3 · answered Mar 31 '12 at 13:12

Try putting a semicolon after dothis() like

dothis();

Then watch what happens to the + and - operator. They will be shifted away from greater or less than sigh and move nearer to 4.

if (3 > +4)
   dothis() //this is never hit btw.. 
            //will never hit in the entire universe

if (3 > -4)
   dothis() //this is hit
            //will always be a hit

First becomes if 3 > +4 (Positive 4) which will always result in false.

Second becomes if 3 > -4 (Negative 4) which will always result in true.

What does >+ and >- mean in C#

3 Answers3

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