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copied!<pre><code>ushort x = 5, y = 12; </code></pre> <p>The following assignment statement will produce a compilation error, <strong>because the arithmetic expression on the right-hand side of the assignment operator evaluates to int</strong> by default.</p> <pre><code>ushort z = x + y; // Error: conversion from int to ushort </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/cbf1574z(v=vs.71).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/cbf1574z(v=vs.71).aspx</a></p> <p>EDIT:<br/> In case of arithmetic operations on ushort, the operands are converted to a type which can hold all values. So that overflow can be avoided. Operands can change in the order of int, uint, long and ulong. Please see the <a href="http://www.microsoft.com/download/en/details.aspx?id=7029" rel="nofollow noreferrer">C# Language Specification</a> In this document go to section 4.1.5 Integral types (around page 80 in the word document). Here you will find:</p> <blockquote> <p>For the binary +, –, *, /, %, &, ^, |, ==, !=, >, <, >=, and <= operators, the operands are converted to type T, where T is the first of int, uint, long, and ulong that <strong>can fully represent all possible values of both operands</strong>. The operation is then performed using the precision of type T, and the type of the result is T (or bool for the relational operators). It is not permitted for one operand to be of type long and the other to be of type ulong with the binary operators.</p> </blockquote> <p>Eric Lipper has stated in a <a href="https://stackoverflow.com/questions/8671427/why-some-types-do-not-have-literal-modifiers">question</a></p> <blockquote> <p>Arithmetic is never done in shorts in C#. Arithmetic can be done in ints, uints, longs and ulongs, but arithmetic is never done in shorts. Shorts promote to int and the arithmetic is done in ints, because like I said before, the vast majority of arithmetic calculations fit into an int. The vast majority do not fit into a short. Short arithmetic is possibly slower on modern hardware which is optimized for ints, and short arithmetic does not take up any less space; it's going to be done in ints or longs on the chip.</p> </blockquote>

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