CODEWITHSUNDEEP
doublebigdecimal
user7951871
user7951871

Reputation: 3

java double to BigDecimal convertion adding extra trailing zero

double d =0.0000001;
BigDecimal d1 = BigDecimal.valueOf(d);
System.out.println(d1.toPlainString());

prints output => 0.00000010 i am expecting 0.0000001

Upvotes: 0

Views: 4066

Answers (2)

Rudy Velthuis
Rudy Velthuis

Reputation: 28806

First, to get a precise BigDecimal value, avoid using a float or double to initialize it. The conversion from text to floating point type is by definition not guaranteed to be precise. The conversion from such a type to BigDecimal is precise, but may not exactly yield the result you expected.

If you can avoid using a double or float for initialization, then do something like this instead:

BigDecimal d = new BigDecimal("0.0000001");

This will already give you the desired output, because the conversion from (decimal) text to BigDecimal is precise.

But if you really must convert from a double, then try:

double d = 0.0000001;
BigDecimal d1 = BigDecimal.valueOf(d);
System.out.println(d1.stripTrailingZeros().toPlainString());

This will strip (remove) any trailing zeroes.

Upvotes: 1

0xf10
0xf10

Reputation: 108

You can use a DecimalFormat to format your BigDecimal.

double d = 0.0000001;
BigDecimal d1 = BigDecimal.valueOf(d);
DecimalFormat df = new DecimalFormat("#0.0000000");
System.out.println(df.format(d1));

Upvotes: 0

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