如何生成一定范围内的随机数

Question

computerTotal = (int) Math.ceil(Math.random() * 21);

Can someone show me how to get 16 - 21 random number I keep getting errors when i try to implement the Math.floor function... As you can see i'm not very good at putting functions within functions.

Many Thanks!

Answer 1

If Java, use the Random Class.

Random r = new Random();
int myRand = 16+ r.nextInt(6); //16+[0-6) = 16-21

Answer 2

For creating random numbers between (including) min and max , you can do this:

Math.floor(Math.random() * (max - min + 1)) + min

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Edit: The JAVA tag was added only after I suggested this; before it had no tags hinting at a specific language at all – so that there might be better/already implemented methods for this in language X is well possible. This is a very generic approach.