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    <p>"is <strong><em>always</em></strong> 32-bit on <strong><em>most</em></strong> platforms" - what's wrong with that snippet? :-)</p> <p>The C standard does not mandate the sizes of many of its integral types. It <em>does</em> mandate relative sizes, for example, <code>sizeof(int) &gt;= sizeof(short)</code> and so on. It also mandates minimum ranges but allows for multiple encoding schemes (two's complement, ones' complement, and sign/magnitude).</p> <p>If you want a specific sized variable, you need to use one suitable for the platform you're running on, such as the use of <code>#ifdef</code>'s, something like:</p> <pre><code>#ifdef LONG_IS_32BITS typedef long int32; #else #ifdef INT_IS_32BITS typedef int int32; #else #error No 32-bit data type available #endif #endif </code></pre> <p>Alternatively, C99 and above allows for exact width integer types <code>intN_t</code> and <code>uintN_t</code>:</p> <hr> <ol> <li>The <code>typedef</code> name <code>intN_t</code> designates a signed integer type with width <code>N</code>, no padding bits, and a two's complement representation. Thus, <code>int8_t</code> denotes a signed integer type with a width of exactly 8 bits.</li> <li>The <code>typedef</code> name <code>uintN_t</code> designates an unsigned integer type with width <code>N</code>. Thus, <code>uint24_t</code> denotes an unsigned integer type with a width of exactly 24 bits.</li> <li>These types are optional. However, if an implementation provides integer types with widths of 8, 16, 32, or 64 bits, no padding bits, and (for the signed types) that have a two's complement representation, it shall define the corresponding <code>typedef</code> names.</li> </ol>
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    1. POIs int in C Always 32-bit?
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    1. COBeat me to it :) Relying upon the size of a built-in variable in C or C++ is inherently a bug.
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    2. COThe C standard does mandate minimum ranges (which implies minimum sizes). The minimum range of int is -32767 to +32767, and the minimum range of long is -2147483647 to +2147483647.
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    3. CO(which means that if you just want a variable that can store the range of a 32 bit integer, use long or unsigned long - no preprocessor bodginess required).
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