Array element point float getting truncated

Question

Double happens:

double ages[] = new double[] {2D, 3D, 4D, 5D};
ages[0] = 7/2;

Index  Element
0      3.0    
1      3.0
2      4.0
3      5.0

Makes sense because:

7 int / 2 int = 3 int

But when it gets appended at the final the suffix D or F to ages[0] = 7/2;, INDEX 0 appears with decimals even when we are dividing integers:

double ages[] = new double[] {2D, 3D, 4D, 5D};
ages[0] = 7/2D;

Index  Element
0      3.5
1      3.0
2      4.0
3      5.0

Why its getting truncated even if the suffix D suppose to be "OPTIONAL"?

`1/3` is `0`. Because `int`/`int` is an `int`. The fact that you widen that `int` to `float` or a `double` doesn't give an `int` more precision. `(double) (1/3)` is still zero. — Elliott Frisch, Apr 12 '20 at 22:53

score 2 · Accepted Answer · answered Apr 12 '20 at 22:53

2

7 / 2 is the int/int operation and therefore the result is 3. When you assign it to a float or double variable, it will become 3.0.

answered Apr 12 '20 at 22:53

Arvind Kumar Avinash

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Can you resolve the new query that I edited in the post, please? – Pablo_06 Apr 12 '20 at 23:16
@Pablo_06 - `7 / 2D = 3.5` because it's `int / double` operation. You can also write it as `7 / 2.0` which will also give you `3.5`. Feel free to comment in case of any further doubt. – Arvind Kumar Avinash Apr 12 '20 at 23:21
So in this case, "D" is not optional? – Pablo_06 Apr 12 '20 at 23:22
I learned suffix "D" should be optional. – Pablo_06 Apr 12 '20 at 23:22
I've already mentioned it in my comment above. – Arvind Kumar Avinash Apr 12 '20 at 23:24
@Pablo_06 It is optional in the literal `2.0D` (`2.0` works as well), but it is required in the literal `2D`, because the literal `2` is an `int` literal, not a `double` literal. – Mark Rotteveel Apr 13 '20 at 09:18

Array element point float getting truncated

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