Segmentation fault: arr[(i * 16) % arrLen] vs arr[i % arrLen]

Working on my assignment, more details in [another question][1]. If I use arr[(i * 16) % arrLen] *= 2; // seg fault vs arr[i % arrLen] *= 2; // OK! Why? **[Full source][2]** see line 31. Why? I modulus the array length so it should be OK? [1]: https://stackoverflow.com/questions/12594208/c-program-to-determine-levels-size-type-of-cache [2]: https://gist.github.com/3787223
They are going to get you 2 different addresses - 1st one may not be valid?

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