java - How to round a big number (precision 19, scale 2) to whole integer? -


i want round big number nearest integer:

ex1:-26,687,872,856,567,000.32, output should be:-26,687,872,856,567,000

ex2:-26,687,872,856,567,000.51, output should be:-26,687,872,856,567,001

i using expression in jasper report:

math.round($v(cost})

and have set $v{cost}, both java.lang.float , java.lang.double, i'm not getting correct results. float displays 2147483647.

you commented:

i changed float double, still not getting expected output. think double can handle 64-bits.

there several misconceptions here. consult the manual.

  • float, float8 , double precision synonyms in postgres type system. may thinking of float4 a.k.a. real, occupies 4 bytes.

  • float 8-byte quantity, "64 bits" right. float still for:

15 decimal digits precision

bold emphasis mine.

your attempt store number precision of 19 (19 significant decimal digits) bound fail. try:

select '-26687872856567777.77'::float::numeric;

result:

-26687872856567800

as can see, number got rounded 15 significant digits.

the solution in manual, too:

if require exact storage , calculations (such monetary amounts), use numeric type instead.

especially numbers more 15 significant digits.

i can't stress enough. use numeric. task simple:

select round('-26687872856567777.77'::numeric);

result:

-26687872856567778

or cast bigint, number rounded automatically. same result, different data type:

select '-26687872856567777.77'::numeric::bigint;

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