Java.math.BigInteger.toString() Method



The java.math.BigInteger.toString(int radix) returns the String representation of this BigInteger in the given radix. If the radix is outside the range from Character.MIN_RADIX to Character.MAX_RADIX inclusive, it will default to 10 (as is the case for Integer.toString).

The digit-to-character mapping provided by Character.forDigit is used, and a minus sign is prepended if appropriate. This representation is compatible with the (String, int) constructor.


Following is the declaration for java.math.BigInteger.toString() method.

public String toString(int radix)


radix − radix of the String representation.

Return Value

This method returns the String representation of this BigInteger in the given radix.




The following example shows the usage of math.BigInteger.toString() 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 String objects
      String s1, s2;

      bi1 = new BigInteger("16");
      bi2 = new BigInteger("-16");

      // assign String value of bi1, bi2 to s1, s2 using radix
      s1 = bi1.toString(8); // octal value of bi1
      s2 = bi2.toString(2); // binary value of bi2

      String str1 = "String value of " +bi1+ " in radix 8 is " +s1;
      String str2 = "String value of " +bi2+ " in radix 2 is " +s2;

      // print s1, s2 values
      System.out.println( str1 );
      System.out.println( str2 );

Let us compile and run the above program, this will produce the following result −

String value of 16 in radix 8 is 20
String value of -16 in radix 2 is -10000