How to test a random generator

Question

I need to test a random number generator which produces numbers randomly. How to make sure the numbers generated are random.

Answer 1

You can't generate true randomness by any algorithm, thus try to visualize your outputs and check for patterns with your own eyes. None random generator (by algorithm) would create some patterns that you can judge them yourself. Here is one of demonstration of that idea: http://www.alife.co.uk/nonrandom/