Comparing floating point numbers in C

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To determine whether it’s close enough to zero that it will print as 0.000000 to six decimal places, something like:

fabs(d) < 0.0000005

Dealing with small inaccuracies in floating-point calculations can get quite complicated in general, though.

If you want a better idea what value you’ve got, try printing with %g instead of %f.

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