The java.math.BigInteger.bitLength() method returns the number of bits in the minimal two’s-complement representation of this BigInteger, excluding a sign bit. For positive BigIntegers, this is equivalent to the number of bits in the ordinary binary representation. The bitLength method Computes (ceil(log2(this < 0 ? -this : this+1))).
Syntax:
public int bitLength()
Parameters: The method does not return any parameters.
Return Value: The method is used to return the number of bits in the minimal two’s-complement representation of this BigInteger, excluding a sign bit.
Examples:
Input: value = 2300 Output: 12 Explanation: Binary signed 2's complement of 2300 = 0000100011111100 first four bits are signed bit so exclude them than remaining no of bits = 12. So bitLength in 0000100011111100 = 12. Input: value = 5482549 Output: 23
Below program illustrates the use of bitLength() method of BigInteger.
// Program to demonstrate bitLength() method of BigInteger import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Create BigInteger objects
BigInteger biginteger = new BigInteger(" 2300 ");
// Call bitLength() method on bigInteger
int count = biginteger.bitLength();
String result = "bitLength of " + biginteger +
" is " + count;
// Print result
System.out.println(result);
}
} |
bitLength of 2300 is 12
Reference:https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#bitLength()