Cannot implicitly convert type 'int' to 'short'?

Question

I've got 3 variables all declared as type 'Int16', yet this code is refusing to work.

    private Int16 _cap;                 // Seat Capacity
    private Int16 _used;                // Seats Filled
    private Int16 _avail;               // Seats Available

    public Int16 SeatsTotal {
        get {
            return _cap;
        }
        set {
            _cap = value;
            _used = _cap - _avail;
        }
    }

Except the part where I have _used = _cap - _avail; is throwing this error, Error

1 Cannot implicitly convert type 'int' to 'short'. An explicit conversion exists (are you missing a cast?)

score 8 · Accepted Answer · answered Nov 21 '12 at 21:41

8

Yes, that's because there's no subtraction operator for short (Int16). So when you write:

_cap - _avail

that's effectively:

(int) _cap - (int) _avail

... with an int result.

You can, of course, just cast the result:

_used = (short) (_cap - _avail);

answered Nov 21 '12 at 21:41

Jon Skeet

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2

Should you use `(short)` or `Convert.Int16()`? – Bob. Nov 21 '12 at 21:43
1

Or for that matter, [any other arithmetic operators](http://stackoverflow.com/questions/1084668/why-is-the-result-of-a-subtraction-of-an-int16-parameter-from-an-int16-variable) either. – PinnyM Nov 21 '12 at 21:44
@Matthew I was just deleting my comment :-) – ta.speot.is Nov 21 '12 at 21:46

Cannot implicitly convert type 'int' to 'short'?

1 Answers1