take the cos(pi/2) shows the wrong result in swift

take the cos(pi/2) shows the wrong result in swift but when I take the sin(pi/2) it shows the correct result.

I'm messing around with math to swift before that I use it in my application but I'm having a problem to calculate the correct results with cos at 90 degrees, pi/2 radians and 270 degrees, 3Pi/2 radians.

the results I get for cos(pi/2) are 6.123233995736766e - 17 when I know that it must be equal to zero...

the same thing happens as well with the seizure of the sin (pi), sin (0), the sin (2 pi) and so on.

6th-17 is zero! After all, you didn't feed it pi, but an approximation.

Welcome to floating point!

"The floating-point operations is like moving a lot of sand. "Whenever you move one you lose a bit of sand and pick up a little dirt".

Kernigham and Plauger

Tags: iOS Developer

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