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Java.math.BigInteger.doubleValue() Method
Description
The java.math.BigInteger.doubleValue() converts this BigInteger to a double. This conversion is similar to the narrowing primitive conversion from double to float.
If this BigInteger has too great a magnitude to represent as a double, it will be converted to Double.NEGATIVE_INFINITY or Double.POSITIVE_INFINITY as appropriate. Even when the return value is finite, this conversion can lose information about the precision of the BigInteger value.
Declaration
Following is the declaration for java.math.BigInteger.doubleValue() method.
public double doubleValue()
Specified by
doubleValue in class Number.
Parameters
NA
Return Value
This method returns this BigInteger converted to a double.
Exception
NA
Example
The following example shows the usage of math.BigInteger.doubleValue() method.
package com.tutorialspoint; import java.math.*; public class BigIntegerDemo { public static void main(String[] args) { // create 2 BigInteger objects BigInteger bi1, bi2; // create 2 Double objects Double d1, d2; // assign value to bi1 bi1 = new BigInteger("123"); // assign a larger value to bi2 bi2 = new BigInteger("12345678"); // assign double value of bi1, bi2 to d1, d2 d1 = bi1.doubleValue(); d2 = bi2.doubleValue(); String str1 = "Double value of " + bi1 + " is " +d1; String str2 = "Double value of " + bi2 + " is " +d2; // print d1, d2 values System.out.println( str1 ); System.out.println( str2 ); } }
Let us compile and run the above program, this will produce the following result −
Double value of 123 is 123.0 Double value of 12345678 is 1.2345678E7
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