3.4.2 PongR: alternate halves

Parent: 3.4 Framework.Number · Guide map

PongR alternates between the lower and upper halves of a range on successive calls. Basically it is like a pong ball where bounce high and low. The first call samples the lower half. The integer and long overloads maintain separate alternation state.

using RandEXom.Framework.Number;

var pong = new PongR(seed: 42);
int lower = pong.Next(0, 10); // 0 through 4
int upper = pong.Next(0, 10); // 5 through 9

For odd-sized ranges, the upper half contains one extra value. For a one-value range, every call returns that value without changing the alternation state. Changing ranges between calls does not reset the alternating half.

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