Which of the following will yield a pseudorandom number in the range [-5, +5), given: Random gen = new Random();
A) gen.nextFloat()*5
B) gen.nextFloat()*10-5
C) gen.nextFloat()*5-10
D) gen.nextInt()*10-5
E) gen.nextInt(10)-5

Question

Quizplus · Accepted Answer

Option A generates a number in the range [0,5), so subtracting 5 will give a range of [-5,0).
Option C generates a number in the range [-10,-5), so adding 5 will give a range of [-5,0).
Option D generates a number in the range [-2147483648,2147483647], so multiplying it by 10 and subtracting 5 will give a range that is too large.
Option E generates a number in the range [-5,4]. However, the distribution is not truly random since it is biased towards smaller numbers. Option B generates a number in the range [0,10) and shifts it to the range [-5,5), resulting in a uniformly distributed pseudorandom number in the desired range.

Which of the Following Will Yield a Pseudorandom Number in the Range