Random integer in the range without random library

I have a question about randomizing a number from a range without using the random library and similar.

I have seen the use of a method to generate noise from a microphone, but it does not have a given range.

Is there anything else? Because I couldn't find any more example of using it with user input (like CPU temp or current date).

by guralover36 in StackOverflow on June 05, 2022.

Answer

Well, this isn't truly random as I mentioned in the comments. But it does what you ask.

• min - smallest value in range (inclusive)
• max - largest value in range (exclusive)

So the range is from min to max-1 inclusive.

public static long rand(int min, int max) {
    return (System.nanoTime()%(max-min)) + min;
}

by WJS on June 05, 2022.