Is there a way that double d + 1 == d in java

Question

I'm just curious if there's a way that d + 1 == d. If d is a double. Maybe someone can share some knowledge with me.

Answer 1

Yes, certainly.

class Main {  
  public static void main(String args[]) { 
    System.out.println(1.0e52 + 1); 
  } 
}

prints

1.0E52

This will actually be true for numbers with absolute value at least 2⁵³, because the mantissa of a double has 52 bits of precision.