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Asked: 2026-06-09T16:58:48+00:00

Possible Duplicate: Why doesn't sin() return the correct value here? I am building an

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Possible Duplicate:
Why doesn't sin() return the correct value here?

I am building an app which will perform math operations like sine (sinf()) and cosine (cost()) on floats. Now when I tried calculating the sinus on 90 (which is 1), I got a result of 0.89… which is trebly wrong. Is there a reason why the result is so off? is there a way to improve it? I have tried using double instead of float and got the same answer… Is it possible it’s only like than when I run it in the simulator, and will work fine on a real iPhone?
And lastly, will using a math parser like GCMathParser or DDMathParser improve there accuracy of the results?

Thanks, :]

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1 Answer

  1. Editorial Team

    The problem is, it’s taking the sine of 90 radians, not degrees. Try sin(M_PI_2) for 90°

    The functions use radians, not degrees.

    To convert degrees to radians use degrees * π / 180, so you can do something like sin( 90 * M_PI / 180 ) which reduces to π / 2 or M_PI_2

    Why doesn't sin() return the correct value?

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