How do you get the mantissa of a float in java?

Question

I'm trying to get the mantissa of a float (just to learn), but it isn't working as expected.

The mantissa of say 5.3 is 53, right? I tried this code:

System.out.println(Float.floatToIntBits(5.3f) & 0x7FFFFF);

It printed 2726298. Shouldn't it remove the exponent bits and leave 53? I tried plenty of things, but this always happens. What am I doing wrong here?

Answer 1

From the article IBM: Java's new math. Floating-point numbers (in Russian) the simplest way to get the mantissa is:

public static double getMantissa(double x) {
    int exponent = Math.getExponent(x);
    return x / Math.pow(2, exponent);
}