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Convert Float to Integer in Groovy gives rounding errors

Steve Wales
Steve Wales asked
Last Modified: 2015-03-04
I am having to grab some data from an Oracle database via Groovy script and dump it into a flat file to upload to a bank for EFT payments.

The data is stored in the database as NUMBER(15,2) - it represents a dollar value.

The bank expects the number to be written out as a string, without the decimal.

My thought was to read the value from the database ($528.10) and store it in a float - which seems to work.

In order to output the value as 0000052810 (value is 10 characters, assuming 8 digits for dollars and last 2 digits for cents) I thought I'd try this.

Float x1
x1 = 528.1
x2 = x1 * 100

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However multiplying the float by 100 is giving me rounding errors.  

I added output of the two values:

println x1.toString()
println x2.toString()

Which gave me:


I could add: x3 = x2.round() to make the output 52810 - but since I'm dealing with financial information here, I'd rather get an exact conversion than rely on rounding.  Anyone able to offer me a clean solution to this ?
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