How To Get User Friendly Values For Trigonometric Functions?

I am developing an android app. for mathematical calculations. There I have some buttons like sin,cos,tan which should show their respective trigonometric values, for that I am usi

Solution 1:

Your problem is that java uses radians and not degrees. You have to convert the angle to rad first.

Double rad = degrees /180 * pi;

Solution 2:

First, trigonometric functions do not work with degrees that you are using. You have to send 3.1415926/2 instead of 90. In this case sin will be much closer to 1 and cos much closer to 0.

But the numbers will still be floating point. If you want to round them for presentation use DecimalFormat class or String.format() method.

Solution 3:

Javadoc to the rescue:

Parameters: a - an angle, in radians.

(emphasis mine)

Convert your degrees into radians first. 360 degrees = 2 * pi.

Solution 4:

Take a look at Math.round().

Also, last time I checked, whenever you devide by 0 you do not get infinity. Division by 0 is undefined.

Also, Java uses radians for trigonometric functions, so be sure you are using radians and not degrees or gradians.