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<pre><code>while(*ptr++) </code></pre> will keep going till the time ptr does not point to the end of this string which is <code>\0</code> (Null Terminator) , This same statement also increments ptr to point to next value on each run, so essentially its saying <code>while this condition is true</code>, keep going. And the condition is <code>while ptr still points to an element of arr</code>; <blockquote> In C++, the definition of NULL is 0, so there is only an aesthetic difference. I prefer to avoid macros, so I use 0. Another problem with NULL is that people sometimes mistakenly believe that it is different from 0 and/or not an integer. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days. </blockquote> <a href="http://www.stroustrup.com/bs_faq2.html#null" rel="nofollow">Reference</a> Edit: <blockquote> But why is it accepting arguments like: while('x')? A letter 'x' is true? </blockquote> No it doesn't mean the letter itself is true, it means that its not NULL, which is 0. Consider it like this. <pre><code>while('x') </code></pre> is the equivalent of saying <pre><code>while('x'!=0) // so that is perfectly acceptable and understandable </code></pre> Edit 2: Here is a simpler example for you to be able to better understand <pre><code>#include <iostream> int main() { int x=0; if(x) { cout<<"If this is shown, x was not 0."; } if(x==0) { cout<<"so does it mean x is true? no: It means your condition 'x==0' is true"; } } </code></pre>
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