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    <p>As everyone else has stated, use <code>strlen</code> not <code>sizeof</code>. The reason this is happening though, is a fundamental concept of <code>C</code> that is different from <code>Java</code>. </p> <p><code>Java</code> does not give you access to <a href="https://en.wikipedia.org/wiki/Pointer_%28computer_programming%29" rel="nofollow">pointers</a>. Not only does <code>C</code> have pointers, but <em>they are fundamental to the design of the language</em>. If you don't understand and use pointers properly in <code>C</code> then things won't make sense, and you will have quite a bit of trouble.</p> <p>So, in this case, <code>sizeof</code> is returning the size of the <code>char *</code> pointer, which is (usually) 4 or 8 bytes. What you want is the length of the data structure "at the other end" of the pointer. This is what <code>strlen</code> encapsulates for you.</p> <p>If you didn't have <code>strlen</code>, you would need to dereference the pointer, then walk the string until you find the null byte marking the end.</p> <pre><code>i = 1; while(*guess++) { i++ } </code></pre> <p>Afterwards, <code>i</code> will hold the length of your string.</p> <p><strong>Update:</strong></p> <p>Your code is fine, except for one minor detail. The <a href="http://en.cppreference.com/w/c/io/fgets" rel="nofollow">docs for fgets</a> note that it will keep the trailing newline char.</p> <p>To fix this, add the following code in between the <code>fgets</code> and <code>strncmp</code> sections:</p> <pre><code>if ( guess[guessLen-1] == '\n' ) { guess[guessLen-1] = '\0'; } </code></pre> <p>That way the trailing newline, if any, gets removed and you are no longer off by one.</p>
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    1. POWhy is fgets() and strncmp() not working in this C code for string comparison?
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    1. USSpencer Rathbun
    1. USSpencer Rathbun
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    1. CO+rep for this post. Thank you very much. I am reading KK based from comments from other readers. I admit that pointers are really weird to me right now. I wish I learned C first and then went to Java...kind of put the cart in front of the horse.
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      1. USGeekyOmega
    2. COJust one small adjustment, size of a `char*` is almost never 1 byte, but usually 4 or 8.
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      1. USJens Gustedt
    3. CO@JensGustedt Arg! Thanks for the pointer :p
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