Cell value got changed/precise after saving excel sheet without any change

I have observed that values in cell got precised when we open excel/csv and save without changing any value.

if original value while opening excel is
123.45678989
change to
123.4567899 (after 10 digit it gets roundoff not considering decimal)

0.0000000089
change to
0.000000009 (after 10 digit it gets roundoff not considering decimal)

1.0000000089E-12
change to
1.000000009E-12

As i didinot change any value in excel but it automatically changed the value while saving i face issue in my code.

In code i need original value as well as changed value , if there is changed value , we need to create a delta. But here i didnot change any value but excel automatically change the value so in code i get original as well as changed value and it by default create delta which i dont want.

How to fix this issue /handle in java code , while saving excel without any change the original value or changed value remain same.

Please give your inputs.

This is happening only for Csv

I saved an Excel file as CSV, closed it, re-opened it and the value was the same.

NOTE: when CSV file is open it DISPLAYS as 123.4567899 but changing the number format to 8 decimal places will show the original value.

Just write 123.45678989 value in csv , save the file and again open it , value change to 123.4567899

In my Java code i need to do some execution only when i changed the value manually

if(originalValue !== changedValue)
{
....
}

original value is 123.45678989
as while saving csv automatically change the value to 123.4567899

As i didnot change it manually still (originalValue!==changedValue) true it will run if loop code which i dont want as i didnot changed the value its csv itself changed it.

How to handle this.?

Just write 123.45678989 value in csv , save the file and again open it , value change to 123.4567899

In my Java code i need to do some execution only when i changed the value manually

if(originalValue !== changedValue)
{
....
}

original value is 123.45678989
as while saving csv automatically change the value to 123.4567899

As i didnot change it manually still (originalValue!==changedValue) true it will run if loop code which i dont want as i didnot changed the value its csv itself changed it.

How to handle this.?

I did exactly that: I opened Excel, put in value, saved file as CSV, closed file, re-opened CSV file and value was the same.

NOTE: when CSV file is open it DISPLAYS as 123.4567899 but changing the number format to 8 decimal places will show the original value.

Did you try the above?

do you want to say to change number format to 8 decimal in excel format cell option?

If i do this also it will change to 123.45678990 not original value this 123.45678989 .

Is there any way that while saving it will not change the value?

No it will not change the value: it will simply show the correct digits: PLEASE try it!