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# BigInteger doubleValue() Method in Java

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 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 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
```

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