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    <p>Easiest way to turn numbers into a string is to use <a href="http://www.cplusplus.com/reference/iostream/ostringstream/" rel="nofollow"><code>ostringstream</code></a></p> <pre><code>#include &lt;sstream&gt; #include &lt;string&gt; std::ostringstream os; os &lt;&lt; x &lt;&lt; y &lt;&lt; z; std::string str = os.str(); // 6490240 </code></pre> <p>You can even make use of manipulators to do this in hex or octal:</p> <pre><code>os &lt;&lt; std::hex &lt;&lt; x &lt;&lt; y &lt;&lt; z; </code></pre> <p><strong>Update</strong></p> <p>Since you've clarified what you really want to do, I've updated my answer. You're looking to take RGB values as three bytes, and use them as a key somehow. This would be best done with a long int, not as a string. You can still stringify the int quite easily, for printing to the screen.</p> <pre><code>unsigned long rgb = 0; byte* b = reinterpret_cast&lt;byte*&gt;(&amp;rgb); b[0] = x; b[1] = y; b[2] = z; // rgb is now the bytes { 0, x, y, z } </code></pre> <p>Then you can use the <code>long int rgb</code> as your key, very efficiently. Whenever you want to print it out, you can still do that:</p> <pre><code>std::cout &lt;&lt; std::hex &lt;&lt; rgb; </code></pre> <p>Depending on the endian-ness of your system, you may need to play around with which bytes of the long int you set. My example overwrites bytes 0-2, but you might want to write bytes 1-3. And you might want to write the order as z, y, x instead of x, y, z. That kind of detail is platform dependent. Although if you never want to print the RGB value, but simply want to consider it as a hash, then you don't need to worry about which bytes you write or in what order.</p>
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    1. POUltra Quick Way To Concatenate Byte Values
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    1. COMany thanks for this, it seems like a neat way inline way of doing it. I was hesitant to use any library functions because the cumulative overheads of calling them would be a performance loss because I might need to do this several 100,000 times. Would you consider this a fast way?
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    2. COThis won't solve the OP's edited question because multiple colors can make the same string.
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    3. COIt clearly enough the simplest way and the most C++ idiomatic way, but what about the speed ? In some case ostringstream perform even worse than the old sprintf. Some measurement could be enlightning.
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