Is double 0.0 is greater or less than 0 in java

Question

I would like to ask for more clarification. Here my sample program

double diff = 7.500 - 7.500;
System.out.println(diff); // result 0.0
if (diff > 0) {
    System.out.println("+" + diff ); //result +0.0
} else {
    System.out.println("-" + diff ); //result -0.0
}

My result is -0.0. My expectation is 0 == 0.0 then skip if else condition. But it enter to the else condition.Is double 0.0 is greater or less than 0?

The `else` clause will be executed if `diff` is not greater than zero. This includes the case where `diff` equals zero. — clstrfsck, May 27 '16 at 02:12
@OP: I don't think you understand how `else` works :( And yet, you still got upvotes. Go figure... — sstan, May 27 '16 at 02:14
@sstan actually I don't want equal case. But seems else includes equals zero condition. — Sai Ye Yan Naing Aye, May 27 '16 at 02:17
Of course it does... How would the `else` know that you want to exclude certain conditions? That's not how `else` works. — sstan, May 27 '16 at 02:20
Hi all , Thanks for answering. But I think @msandiford comment is correct answer — Sai Ye Yan Naing Aye, May 27 '16 at 02:23

score 10 · Answer 1 · answered May 27 '16 at 02:12

10

Note that you are checking if diff > 0 - so if it IS zero, you are printing -0.0

answered May 27 '16 at 02:12

lostbard

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sonique · Answer 2 · 2016-05-27T02:15:07.177

4

In your case, you compare 0.0 to 0 using (greater) > so 0.0 is not strictly greater than 0, (it is equal). Then your programme go to the else section.

if(diff == 0 ) {
    System.out.println("+" + diff ); //result 0.0
} else if (diff > 0) {
    System.out.println("+" + diff ); //result +diff
} else { // diff is less than 0 
    System.out.println("-" + diff ); //result -diff
}

edited May 27 '16 at 02:15

answered May 27 '16 at 02:09

sonique

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score 2 · Accepted Answer · answered May 27 '16 at 02:25

this is my answer:

double diff = 7.500 - 7.500;
    System.out.println(diff);

    if(diff>0){
        System.out.println("+"+diff);
    }else if(diff<0){
        System.out.println("-"+diff);
    }else if(diff==0){
        System.out.println("="+diff);
    }
}

and my result is this :
0.0
=0.0

you must forget that the 0.0 equal 0 is 'else the 0.0 > 0' other the '0.0 >= 0'

Is double 0.0 is greater or less than 0 in java

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