I need to find the modulo for float numbers.
For that, I am using
NSLog(@"value >> %f",fmodf(2.0f, 0.1f));
The output for this should be 0.0f
But I am getting the output value >> 0.1
How?
Issue with fmodf for getting the Modulo
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The compiler converts the source text
0.1fto the nearest representable value. The IEEE-754 32-bit floating-point value (which iOS uses) nearest .1 is 0.100000001490116119384765625.The you evaluate
fmodfwith the arguments 2 and 0.100000001490116119384765625. After subtracting 19 times the latter value from 2, the residue is 0.099999971687793731689453125, so that is the returned value. When it is rounded to a few digits for display, the result is “0.1”.