double - Round of a negative decimal in C -

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i need round of decimal numbers precision in c program. facing difficulties in these type of examples 

x = -0.000000001235

which when rounded (using %.5f) 5 decimals prints -0.00000.

how should remove negative sign?

if number greater -0.000005 round absolute value. can knock 1 on head simple ternary.

if want compare numbers tolerance of 5th decimal place use fabs(a - b) < 0.00001 test equality. don't understand why you'd ever want round numbers explicitly, let alone %.5f comes in.


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