'Convert from Radians to Degrees Wrong

I need to convert radians to degrees. I have tried this by x*180/Pi the problem is my output angles are in degrees minutes seconds so the small error in conversion leads to big problems. 

For example: (aCos(0)*180)/Pi = 90.00000250

In the base 10 universe it should by 90.00000000

objective-c


Solution 1:[1]

Use the following macro in your code to convert radians to degrees:

#define RADIANS_TO_DEGREES(radians) ((radians) * (180.0 / M_PI))

Example:

NSLog(@"Output radians as degrees: %f", RADIANS_TO_DEGREES(0.785398));

via this link.

Solution 2:[2]

The right solution is to import GLKit
Then you can use the following 2 functions already implemented by GLKit :
GLKMathDegreesToRadians()
GLKMathRadiansToDegrees()

With GLKit the values returned by the functions are good !

Objective-C :

import <GLKit.h>

float angleInRadian = GLKMathDegreesToRadians(360.0);
// Return 6.2831854820
float angleInDegrees = GLKMathRadiansToDegrees(angleInRadian);
// Return 360.0000000000

Swift :

import GLKit

let angleInRadian: Float = GLKMathDegreesToRadians(360.0)
// Return 6.2831855
let angleInDegrees: Float = GLKMathRadiansToDegrees(angleInRadian)
// Return 360.0

Solution 3:[3]

This worked for me. You can also #import <GLKit/GLKit.h> and use GLKMathDegreesToRadians() or GLKMathRadiansToDegrees().

-(CGFloat) degreesToRadians:(CGFloat) degrees {
    return degrees == 0.0 ? 0: degrees * M_PI / 180;
}

-(CGFloat) radiansToDegrees:(CGFloat) radians {
    return radians == 0.0 ? 0: radians * 180 / M_PI;
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 The Kraken
Solution 2
Solution 3 Pedro Trujillo

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