Iterating through all float values with Java

Question

I'm developing a math function and would like to test its output at every float value within a range. I have already done this in C++ but now I want to compare the performance to Java. How do I iterate through all float values in Java?

In C++, I'm simply iterating through the necessary range with an unsigned int, then reinterpreting it as a float pointer

float *x = reinterpret_cast<float*>(&i);

However, how can this be done in Java? Preferably quickly, as I am testing the performance (no String solutions thank you :D ). If there's no fast way, I guess I could just pre-calculate a million of them into an array and iterate through them. But that would mess up the cache performance, so I think using random numbers would then be better for my case, although it won't quite hit all values.

Answer 1

You can use Math.nextUp(float) to get the next float number.

Example to print the next 100 floats starting from 1:

float n = 1f;
System.out.println(n);

for (int i = 0; i < 100; i++) {
    n = Math.nextUp(n);
    System.out.println(n);
}