BigInteger doubleValue() Method in Java
Last Updated :
04 Dec, 2018
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:
import java.math.BigInteger;
public class GFG {
public static void main(String[] args)
{
BigInteger b1, b2;
b1 = new BigInteger( "32145" );
b2 = new BigInteger( "7613721" );
double doubleValueOfb1 = b1.doubleValue();
double doubleValueOfb2 = b2.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.
import java.math.BigInteger;
public class GFG {
public static void main(String[] args)
{
BigInteger b1, b2;
b1 = new BigInteger( "32145535361361525377" );
b2 = new BigInteger( "7613721535372632367351" );
double doubleValueOfb1 = b1.doubleValue();
double doubleValueOfb2 = b2.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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