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Version with BigDecimal to show more digits.

MainPi.java

@@ -3,38 +3,53 @@
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
 
 public class MainPi {
 
 	public static void main(String[] args) throws NumberFormatException, IOException {
 
 		/*manual precision*/
+		/*
+
 		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 		System.out.print("Enter number of time to do the sum: ");
 		long nbRepetition = Long.parseLong(reader.readLine());
-
-		/*Max precision:*/
-		//long nbRepetition = Long.MAX_VALUE;
-
+
+		 */
 
 
+		/*Max precision:*/
+		long nbRepetition = Long.MAX_VALUE;
+
+
+
 		//the taylor series
-		Double pi = 0.0 , temp = 0.0 ;
+		Double piDouble = 0.0;
+
+		BigDecimal pi = new BigDecimal(piDouble);
 		for(long i = 0; i < nbRepetition; i++) {
-			//temporary variable
-			temp = (Math.pow((-1), i)) / ((2*i)+1);
-			//add previous temporary variable to actual sum
-			pi = pi + temp;
+
+			BigDecimal temp = new BigDecimal((2.0*i)+1.0);
+			BigDecimal temp2 = new BigDecimal(Math.pow((-1), i));
+
+			BigDecimal operation = temp2.divide(temp, 5000, RoundingMode.HALF_UP);
+			pi = pi.add(operation);
+
+			BigDecimal temp3 = new BigDecimal(4.0);
+			System.out.println(i + ": " + (pi.multiply(temp3)));
 		}
-		// ***4*** arctanx  x = 1 = Pi
-		pi = pi*4.0;
 
 
 
-		//print
-		System.out.println("\n\nAproximation de Pi: \n\n" + pi);
+		// ***4*** arctanx  x = 1 = Pi
+		BigDecimal mult = new BigDecimal(4.0);
+		pi = pi.multiply(mult);
+
 
-		//difference with Pi from Eclipse -- Math.PI
-		System.out.println(pi - Math.PI);
+
+		//print
+		System.out.println("\n\nPi: \n\n" + pi + "\n\n");
 	}
 }