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    <p>I can't really remember if this ever worked in C#, but I am quite certain it should not work now.</p> <p>To start off by answering your question. There is no automatic cast between pointers and bool. You need to write </p> <pre><code>if(str != null) </code></pre> <p>Secondly, you can't convert char to bool. Moreover, there is no terminating character for C# strings, so you can't even implement this. Normally, you would write:</p> <pre><code>while(*end != '\0') // not correct, for illustration only </code></pre> <p>But there is no '\0' char, or any other magic-termination-char. So you will need to take an int param for length.</p> <p>Going back to the big picture, this sort of code seems like a terribly inappropriate place to start learning C#. It's way too low level, few C# programmers deal with pointers, chars and unsafe contexts on a daily basis.</p> <p>... and if you must know how to fix your current code, here's a working program:</p> <pre><code>unsafe public static void Main(string[] args) { var str = "Hello, World"; fixed(char* chr = str){ reverse(chr, str.Length); } } unsafe void reverse(char *str, int length) { char* end = str; char tmp; if (str != null) //Cannot implicitly convert type 'char*' to 'bool' { for(int i = 0; i &lt; length; ++i) //Cannot implicitly convert type 'char*' to 'bool' { ++end; } --end; while(str&lt;end) { tmp = *str; *str = *end; *end = tmp; --end; ++str; } } } </code></pre> <p>Edit: removed a couple of .Dump() calls, as I was trying it out in LINQPad :)</p>
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    1. POCannot implicitly convert type 'char*' to 'bool'
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    1. USVlad Ciobanu
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    1. COThere *is* a `'\0'` character, but it isn't a terminating character. I'm guessing though, that in this case it would. This reeks of C-strings.
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      1. USKendall Frey
 

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