fortran - Adding large numbers returns strange, large numbers -

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i trying calculations in fortran looks like:

large number (order e40) - large number (order e40)

i should zero. of time works, in couple of cases i'm getting weird numbers. 1 answer fortran gave me -1e20. weird answer got 32768, 2^15, oddly enough.

does have clue why happening?

it's hard tell without actual code, but...

this expected if numbers sufficiently similar. while 1e20 pretty large compared 1 or 2, pretty small compared 1e40.

in fact, double precision, have 15-17 digits of precision. considering that, values below accuracy possible numbers in range of 1e40.

what see numerical noise.

[ possibility, of course, trying in single precision. not possible (max. exponent ~38) , might happen. ]


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