No implicit int -> short conversion in ternary statement

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The compiler has an implicit conversion from a constant expression to various primitive types (so long as the value is within the appropriate range), but here the expression isn’t constant – it’s just an int expression. It’s pretty much the same as:

short s;
s = CallSomeMethodReturningInt32();

as far as the compiler is concerned.

There are two options – you could cast the whole expression, or cast each of the latter two operands:

short s = (EitherTrueOrFalse()) ? (short) 0 : (short) 1;

to make the overall expression type short. In this particular case, it’s a pity that there isn’t a numeric literal suffix to explicitly declare a short literal. Apparently the language designers did consider this, but felt it was a relatively rare situation. (I think I’d probably agree.)

The part about implicit constant conversions is from the C# 3.0 spec section 6.1.8:

6.1.8 Implicit constant expression conversions

An implicit constant
expression conversion permits the
following conversions:

  • A constant-expression (ยง7.18) of type
    int can be converted to type sbyte,
    byte, short, ushort, uint, or ulong,
    provided the value of the
    constant-expression is within the
    range of the destination type.
  • A
    constant-expression of type long can
    be converted to type ulong, provided
    the value of the constant-expression
    is not negative.

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