Question

How to calculate PI value with atan() function in Java

Answer 1

package javaapplication1;
 
public class Example {
    public static void main(String[] args) {

        double pi;
        
        pi = Math.atan(1) * 4;
	
        System.out.format("pi = %f\n", pi);
    }
}
 
/*
run:
  
pi = 3.141593
  
*/

 

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Answer 2

package javaapplication1;
 
public class Example {
    public static void main(String[] args) {

        double pi;
        
        pi = 2 * Math.atan(Double.POSITIVE_INFINITY);
	
        System.out.format("pi = %f\n", pi);
    }
}
 
/*
run:
  
pi = 3.141593
  
*/

 

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