computpi.java

tutorial solutions for java programing

// Exercise 3.9

public class ComputPI { //saved as "ComputPI.java"
	
	public static void main (String[] args) {
		
		int numTerms = 50000;
		
		double sum = 0.0;
		
		double PI;
   
		//calculate PI
		
		for (int denominator = 1; denominator <= numTerms; denominator++){

			if ( denominator % 4 == 1 ){
                
				sum = sum + 1.0/denominator;
            
			}else if( denominator % 4 == 3){

				sum = sum - 1.0/denominator;

			}
			
		
		}
		
		PI = sum * 4;
		
		System.out.println("the value of PI is " + PI);
	
	}

}