Java > Logic-1 > less20 (CodingBat Solution)

Problem:

Return true if the given non-negative number is 1 or 2 less than a multiple of 20. So for example 38 and 39 return true, but 40 returns false. See also: Introduction to Mod

less20(18) → true
less20(19) → true
less20(20) → false

Solution:

public boolean less20(int n) {
    return (n + 1) % 20 == 0 || (n + 2) % 20 == 0;
}