Java BigInteger bitLength() Method

The bitLength() method of Java BigInteger class returns an int value which corresponds to the number of bits in the minimal two's-complement representation of this BigInteger, excluding a sign bit.

Syntax:

Returns:

This method returns number of bits in the minimal two's-complement representation of this BigInteger, excluding a sign bit.

Note:For positive BigIntegers, this is equivalent to the number of bits in the ordinary binary representation. It Computes (ceil (log2(this <0 " "this: this+1))).

Example

import java.math.BigInteger;

public class BigIntegerBitLengthExample {
public static void main(String[]  args){
// create  2  BigInteger objects
BigInteger   big1,big2 ;
// create  2 int  objects
int i1,i2 ;

// assign values to big1, big2
big1= new BigInteger("8");  // 1000    
big2 =new BigInteger("-9");  // 0110

//perform bitlength  operation on big1,  big2
i1 = big1.bitLength();   //total no of  bitsafter excluding sign bit
i2 = big2.bitLength();   //total no of  bitsafter excluding sign bit

String str1="Result of  bitLength operation  on "+ big1+" is "+ i1;
String str2="Result of  bitLength operation  on "+ big2+" is "+ i2;

System.out.println(str1);   
System.out.println(str2);   
}
}

Test it Now

Output:

Result of bitLength operation on 8 is 4
Result of bitLength operation on -9 is 4

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