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    <p>There are cases when you need to declare the function prototype beforehand, i.e. the compiler needs to know a functions prototype before you are able to use that function.</p> <p>Consider these functions that do nothing particularly useful:</p> <pre><code>int foo(int x) { if(x &lt; 1) return x; else return x + bar(x-1); } int bar(int x) { if(x &lt; 3) return x; return x * foo(x-1); } </code></pre> <p>If you try to compile this, the compiler gets mad at you:</p> <blockquote> <p>error: 'bar' was not declared in this scope</p> </blockquote> <p>You need to put the missing prototypes in front of the function using it:</p> <pre><code>int bar(int); // as above unchanged </code></pre> <p>This is the only case where the compiler requires you to put a function prototype before your functions. In all other cases it is perfectly legal to put prototypes anywhere as often as you'd like, so this is also legal:</p> <pre><code>int foo(int); int bar(int); int foo(int); int bar(int); </code></pre> <p>Though obviously redundant (please don't do that). Some people consider it good style to put a function prototype of every function within a file at the top of the file, because</p> <ol> <li>you don't have to care about cases in which the compiler requires you to do it anymore, and some people apparently cannot interpret the error message by the compiler (which I think is very concise), and</li> <li>you see on one view what functions are provided by the file and how they are called.</li> </ol> <p>But this is exactly that, a style discussion. I like to keep my code as short as possible, so I would only use the prototypes that are required by the compiler, but that's purely a matter of taste and convention. When in Rome, do as the Romans or something like that.</p>
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    1. COThanks for the answer. The question was not about style, I just wanted to be sure there were no *technical* side-effects of using option 1 (which is the style I prefer myself).
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