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how can i solve prescision error when comparing to long double value?

i use fabs(a - b) <= EPS where EPS is 1e-15, but its not working.
use fabs(a - b) < EPS also but its not working again.

This depends on the problem.
But I think 1e-15 is too small. I ususally use 1e-9 or even 1e-6.