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BigInteger doubleValue() Method in Java

Last Updated : 04 Dec, 2018
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The java.math.BigInteger.doubleValue() converts this BigInteger to a double value. If the value return by this function is too big for a magnitude to represent as a double then it will be converted to Double.NEGATIVE_INFINITY or Double.POSITIVE_INFINITY as appropriate. There is a chance that this conversion can lose information about the precision of the BigInteger value. Syntax: 
public double doubleValue()
Return Value: The method returns a double value which represents double value for this BigInteger. Examples: 
 Input: BigInteger1=32145 Output: 32145.0 Explanation: BigInteger1.doubleValue()=32145.0. Input: BigInteger1=32145535361361525377 Output: 3.2145535E19 Explanation: BigInteger1.doubleValue()=3.2145535E19. This BigInteger is too big for a magnitude to represent as a double then it will be converted to Double.NEGATIVE_INFINITY or Double.POSITIVE_INFINITY as appropriate.
Below programs illustrate doubleValue() method of BigInteger class: Example 1: Java 
// Java program to demonstrate doubleValue() method of BigInteger import java.math.BigInteger; public class GFG {  public static void main(String[] args)  {  // Creating 2 BigInteger objects  BigInteger b1, b2;  b1 = new BigInteger("32145");  b2 = new BigInteger("7613721");  // apply doubleValue() method  double doubleValueOfb1 = b1.doubleValue();  double doubleValueOfb2 = b2.doubleValue();  // print doubleValue  System.out.println("doubleValue of " + b1 + " : " + doubleValueOfb1);  System.out.println("doubleValue of " + b2 + " : " + doubleValueOfb2);  } }
Output: 
 doubleValue of 32145 : 32145.0 doubleValue of 7613721 : 7613721.0
Example 2: When returned double value is too big for a magnitude to represent as a double. Java 
// Java program to demonstrate doubleValue() method of BigInteger import java.math.BigInteger; public class GFG {  public static void main(String[] args)  {  // Creating 2 BigInteger objects  BigInteger b1, b2;  b1 = new BigInteger("32145535361361525377");  b2 = new BigInteger("7613721535372632367351");  // apply doubleValue() method  double doubleValueOfb1 = b1.doubleValue();  double doubleValueOfb2 = b2.doubleValue();  // print doubleValue  System.out.println("doubleValue of " + b1 + " : " + doubleValueOfb1);  System.out.println("doubleValue of " + b2 + " : " + doubleValueOfb2);  } }
Output: 
 doubleValue of 32145535361361525377 : 3.2145535361361527E19 doubleValue of 7613721535372632367351 : 7.613721535372632E21
Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#doubleValue()

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AmanSingh2210
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