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    <p><code>size_t</code> is an unsigned type. So, it cannot represent any negative values(&lt;0). You use it when you are counting something, and are sure that it cannot be negative. For example, <a href="http://devdocs.io/c/string/byte/strlen" rel="noreferrer"><code>strlen()</code></a> returns a <code>size_t</code> because the length of a string has to be at least 0.</p> <p>In your example, if your loop index is going to be always greater than 0, it might make sense to use <code>size_t</code>, or any other unsigned data type.</p> <p>When you use a <code>size_t</code> object, you have to make sure that in all the contexts it is used, including arithmetic, you want non-negative values. For example, let's say you have:</p> <pre><code>size_t s1 = strlen(str1); size_t s2 = strlen(str2); </code></pre> <p>and you want to find the difference of the lengths of <code>str2</code> and <code>str1</code>. You cannot do:</p> <pre><code>int diff = s2 - s1; /* bad */ </code></pre> <p>This is because the value assigned to <code>diff</code> is always going to be a positive number, even when <code>s2 &lt; s1</code>, because the calculation is done with unsigned types. In this case, depending upon what your use case is, you might be better off using <code>int</code> (or <code>long long</code>) for <code>s1</code> and <code>s2</code>.</p> <p>There are some functions in C/POSIX that could/should use <code>size_t</code>, but don't because of historical reasons. For example, the second parameter to <code>fgets</code> should ideally be <code>size_t</code>, but is <code>int</code>.</p>
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    1. POWhat is size_t in C?
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    1. USGaurang Tandon
    1. USAlok Singhal
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    1. CO@Alok: Two questions: 1) what is the size of [`size_t`](http://codepad.org/osT7Ex1q#output)? 2) why should I prefer `size_t` over something like `unsigned int`?
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      1. USLazer
    2. CO`size_t` isn't guaranteed to be the same thing as `unsigned int` (you seem to be implying that they're the same).
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      1. USBrendan Long
    3. CO@Lazer: the size of `size_t` is `sizeof(size_t)`. The C standard guarantees that `SIZE_MAX` will be at least 65535. `size_t` is the type returned by `sizeof` operator, and is used in the standard library (for example `strlen` returns `size_t`). As Brendan said, `size_t` need not be the same as `unsigned int`.
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