Format BigDecimal to string with scientific notation and viceversa

Question

I have a function called factorial which calculates factorial for a large number and returns in BidDecimal

BigDecimal temp_val1 = factorial(555);

the above gives 66140856092779467090983316712427699021235xxxxxxxxxxxxxxxxxxxxx

Now i have to format the BigDecimal value to string with scientific notation

NumberFormat sci_formate = new DecimalFormat("0.#####E0");
String temp_s1 = sci_formate.format(temp_val1);

the above gives 6.61409E1283

Now i need to convert the string temp_s1(6.61409E1283) back to BigDecimal which gives the value of temp_val1....???? How to do that....

Evgeniy Dorofeev · Accepted Answer · 2014-01-21 04:27:45Z

1

try this

BigDecimal temp_val1 = new BigDecimal("6.61409E1283");

to format use

BigDecimal.toEngineeringString()

answered Jan 21, 2014 at 4:27

Evgeniy Dorofeev

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4 Comments

Giri Dhar Over a year ago

BigDecimal temp_val1 = new BigDecimal("6.61409E1283"); gives 6.61409E+1283. BigDecimal.toEngineeringString() returns the string representation of the decimal, how to cast this string to bigdecimal??

Evgeniy Dorofeev Over a year ago

You cannot case String to BigDecimal you can parse it, new BigDecimal("6.61409E1283") parses it

Giri Dhar Over a year ago

BigDecimal temp_val1 = factorial(555); gives 66140856092779467090983316712427699021235xxxxxxxxxxxxxxxxxxxxx. Now i will format using DecimalFormat to show in scientific notation. NumberFormat sci_formate = new DecimalFormat("0.#####E0");String temp_s1 = sci_formate.format(temp_val1); which gives 6.61409E1283. Now i need to convert this String(6.61409E1283) back to BigDecimal which gives same value as temp_val1......

Obicere Over a year ago

@GiriDhar doing exactly that will result in loss of precision.

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