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

It depends how severe your requirement for randomness is. If it is not too severe, what I do is generate a large number of random numbers, find their frequencies and then use the frequencies to plot a graph using a spreadshhet like that in Open Office. If the distribution looks OK, then I'm good to go.