Number of decimal digits in a double [closed]

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A double is not always an exact representation. You can only say how many decimal places you would have if you converted it to a String.

double d= 234.12413;
String text = Double.toString(Math.abs(d));
int integerPlaces = text.indexOf('.');
int decimalPlaces = text.length() - integerPlaces - 1;

This will only work for numbers which are not turned into exponent notation. You might consider 1.0 to have one or no decimal places.

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