Java Floating-Point Comparison - double / float Variable Comparison with Epsilon - Java Programming

Floating-point numbers should not be compared using == because some of these numbers cannot be exactly represented

You may expect them to be equal when comparing them, but instead they are just very close and == will come out as false

Therefore, floating-point numbers should not be compared for exact equality but instead for being close enough

The epsilon is a difference threshold for indicating that floating-point numbers are equal (it is usually 0.0001)

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Floating-point Comparison

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[Appficial]

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[AlexTechie]

Thanks for the video. I really don't understand why this isn't taught earlier on in the educational process. I've been coding for a few years (as a hobby) and just recently found out about this.

[Mirtguitar]

I was about to click like on it, but...mm, you got a NICE mate...

[blacklistjeol]

how would you use epsilon for comparing <= ?

[aahaanchawla]

public static double approx(double a) {
double epsilon =
if (Math.abs(a - Math.round(1000.0 * a) / 1000.0) <= epsilon)
return Math.round(1000.0 * a) / 1000.0;
else
return a;
//it just approximates to the nearest thousandths if and only if it is very close
//for eg gets approximated to 1 but 0.9 does not


}
public static BigDecimal approx(BigDecimal a) {
double epsilon =
if ((a.subtract(a.setScale(4, <= epsilon)
return a.setScale(4, RoundingMode.HALF_UP);
else
return a;

}
}

[catharperfect]

var result = (Math.abs(a - b) < EPSILON) ? "Same" : "Not the same";
System.out.println(result);