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copied!<p>The compiler has an implicit conversion from a <em>constant</em> 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:</p> <pre><code>short s; s = CallSomeMethodReturningInt32(); </code></pre> <p>as far as the compiler is concerned.</p> <p>There are two options - you could cast the whole expression, or cast each of the latter two operands:</p> <pre><code>short s = (EitherTrueOrFalse()) ? (short) 0 : (short) 1; </code></pre> <p>to make the overall expression type <code>short</code>. In this particular case, it's a pity that there isn't a numeric literal suffix to explicitly declare a <code>short</code> literal. Apparently the language designers did consider this, but felt it was a relatively rare situation. (I think I'd probably agree.)</p> <p>The part about implicit constant conversions is from the C# 3.0 spec section 6.1.8:</p> <blockquote> <p><strong>6.1.8 Implicit constant expression conversions</strong></p> <p>An implicit constant expression conversion permits the following conversions:</p> <ul> <li>A <em>constant-expression</em> (§7.18) of type <code>int</code> can be converted to type sbyte, <code>byte</code>, <code>short</code>, <code>ushort</code>, <code>uint</code>, or <code>ulong</code>, provided the value of the <em>constant-expression</em> is within the range of the destination type.</li> <li>A <em>constant-expression</em> of type <code>long</code> can be converted to type <code>ulong</code>, provided the value of the <em>constant-expression</em> is not negative.</li> </ul> </blockquote>

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