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    <p>You need to initialize <code>charcount</code>. Other than that, it should work, provided that <code>z</code> is a zero-terminated array of characters and <code>m</code> is an <code>int</code> or similar. I would probably write just <code>z[m]</code> rather than <code>z[m] != 0</code> (since !0 = true and 0 = false), but both work. There are more efficient ways of doing it (although these days I bet a compiler will handle converting this into a pointer-based loop for you).</p> <p>Here's a complete, correct example with minimal edits:</p> <pre><code>const char * z = "testing one two three"; int m; int charcount; charcount = 0; for(m=0; z[m]; m++) { if(z[m] != ' ') { charcount ++; } } </code></pre> <p>If you're using a <code>String</code> class of some kind rather than an old-fashioned C null-terminated array, you'll want to look at that class for how to loop through it.</p> <p>All of the above also assumes you're dealing with ASCII strings. If you're dealing with UTF-encoded strings, you have to handle multi-byte characters.</p> <hr> <p>Re your edit: It makes a big difference: <code>scanf</code> will <a href="http://www.cplusplus.com/reference/clibrary/cstdio/scanf/" rel="nofollow noreferrer">stop on the first blank</a> (I'd forgotten that). It might make an even bigger difference than that, though, if you're not declaring <code>z</code> correctly. (I'd also recommend using a field width when using <code>scanf</code> for reading strings [or avoiding <code>scanf</code> entirely]; otherwise, you have no control over the number of chars it will try to store, and so <em>in theory</em>, no buffer will ever be big enough to avoid an overflow. More here: <a href="http://www.crasseux.com/books/ctutorial/String-overflows-with-scanf.html" rel="nofollow noreferrer">http://www.crasseux.com/books/ctutorial/String-overflows-with-scanf.html</a>)</p>
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    1. POCounting characters in C
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    1. CO`'\0'` and `0` are the same. One is not more correct than the other. One can, perhaps, be more *stylish* than the other.
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    2. CO@pmg: No, they're not. `'\0'` is a `char`, `0` is an `int`. It's a distinction that makes no difference in this code, though.
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    3. COTry this: `sizeof '\0'`. I don't think I've ever seen a literal char in `C` (except inside `char[]`).
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