Understanding Mathematical Formula in Java [closed]

Question

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.

Closed 8 years ago.

Im just trying to get back into the way of programming in the Java language after having a rather large break so I decided to write a program that calculates PI to the users input number:

e.g. they enter 5, it would return 3.14159.

I've come across the Leibnez formula after a bit of searching but don't know how to implement in code. This seems to be a recurring problem so I'd like to rectify that. Anyone got any resources that demonstrate how to code mathematical formula?

For example, stuff that explains 1e6 and so on?

Cheers

Answer 1

As a starting point you could use this code, it implements the sum notation as described here Leibniz formula for π

public class PI {
    public static void main( String[] args) {
        double PI4 = 1.0;
        for ( int i = 1 ; i <= 50 ; i++ ) {
            double nom = Math.pow( -1, i );
            double denom = 2 * i + 1;
            PI4 += nom / denom;
        }
        System.out.println( "result=" + PI4 * 4 );
    }

}

After 50 iterations the result is 3.1611986129870506

Answer 2

I recommend reading a good math tutorial online so you understand the math first. Then a good basic programming tutorial should do the job.

Stack Exchange's Math section is a good reference of math concepts as well.