Need for predictable random generator

Question

I\'m a web-game developer and I got a problem with random numbers. Let\'s say that a player has 20% chance to get a critical hit with his sword. That means, 1 out of 5 hits

Answer 1

Unfortunately what you are asking for is effectively an non-random number generator - because you want previous results to be taken into account when determining the next number. This isn't how random number generators work I'm afraid.

If you want 1 out of every 5 hits to be a critical then simply pick a number between 1 and 5 and say that that hit will be a critical.