Question about "=="

[Scott Xia]

code block under:
System.out.println(0.9F==0.9D); //get flase
System.out.println(10.0F==10.0D); //get true
System.out.println(10==10.0D); //get true
anyone clear me on this question ,thanks

[Valentin Crettaz]

it's some kind of precision problem, i.e.
float f = 0.9f;
double d = 0.9d;
System.out.println((double)f);
System.out.println(d);
prints
0.8999999761581421
0.9
Does it clears things up ?
Val

[Scott Xia]

thank you i got it