SOME THINGS YOU SHOULD KNOW ABOUT FLOATING-POINT ARITHMETIC

Active member

public class Fp1 {
public static void main(String[] args) {
double val1 = 0.1;
double val2 = 0.3;

double d = val1 + val1 + val1;

if (d != val2) {
System.out.println("d != val2");
}

System.out.println(
"d - val2 = " + (d - val2));
}
}
Everyone knows that: 0.1 + 0.1 + 0.1 == 0.3
at least in mathematical terms. But when you run the Fp1 program, you discover that this equality no longer holds. The program output looks like this: d != val2
d - val2 = 5.551115123125783E-17
This result seems to indicate that 0.1 + 0.1 + 0.1 differs from 0.3 by about 5.55e-17. What is wrong here? The problem is that IEEE 754 floating-point arithmetic, as found in the Java language, doesn't use decimals to represent numbers. Instead it uses binary fractions and exponents.

Active member

can plzzz expain me bollean data type plzz!!!1