http://googleresearch.blogspot.com/2006/06/extra-extra-read-all-about-it-nearly.html
We see the following form of code very often.
int low = ...; int high = ...; int mid =(low + high) / 2;
But be aware of subtle overflow here. low + high can be larger than the maximum value of int range. Open ssh vunlerability was also due to subtle overflow.
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