java.math.BigInteger.intValueExact() was introduced in Java 8. It is an inbuilt function which converts the value of BigInteger to a int and checks for lost information. If the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; the method will throw ArithmeticException as BigInteger doesn’t fit in int range.
Syntax:
public int intValueExact()
Return Value: This method returns the int value of this BigInteger.
Exception: The method throws ArithmeticException if the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; as this range doesn’t fit in int range.
Example:
Input: 4561561 Output: 4561561 Explanation: 4561561 is given as input which is bigInteger and int value of 4561561 is 4561561 Input: -8546512 Output: -8546512 Explanation: -8546512 is given as input which is bigInteger and int value of -8546512 is -8546512 Input: 3000000000 Output: ArithmeticException Explanation: When 3000000000 is tried to convert to int, since 3000000000 > 2,147,483,647 (greater than a int's range), therefore it throws an arithmetic exception.
Below programs illustrates intValueExact() method of BigInteger class:
Program 1: To demonstrate intValueExact() method for positive number <2,147,483,647
// Java program to demonstrate intValueExact()// method of BigInteger Class import java.math.*; public class GFG { public static void main(String[] args) { // Creating a BigInteger object BigInteger big; big = new BigInteger("4561561"); // print value of BigInteger System.out.println("BigInteger value : " + big); // convert big to the int value int b1 = big.intValueExact(); // print int value System.out.println("int converted value : " + b1); }} |
BigInteger value : 4561561 int converted value : 4561561
Program 2: To demonstrate intValueExact() method for negative number >-2,147,483,648
// Java program to demonstrate intValueExact()// method of BigInteger Class import java.math.*; public class GFG { public static void main(String[] args) { // Creating a BigInteger object BigInteger big = new BigInteger("-8546512"); // print value of BigInteger System.out.println("BigInteger value : " + big); // convert big to the int value int b1 = big.intValueExact(); // print int value System.out.println("int converted value : " + b1); }} |
BigInteger value : -8546512 int converted value : -8546512
Program 3: To demonstrate intValueExact() method for negative number <-2,147,483,648. It will throw Arithmetic Exception
// Java program to demonstrate intValueExact()// method of BigInteger Class import java.math.*; public class GFG { public static void main(String[] args) { // Creating a BigInteger object BigInteger big = new BigInteger("-3000000000"); // print value of BigInteger System.out.println("BigInteger value : " + big); try { // convert big to the int value int b1 = big.intValueExact(); // print int value System.out.println("int converted value : " + b1); } catch (Exception e) { System.out.println("Exception: " + e); } }} |
BigInteger value : -3000000000 Exception: java.lang.ArithmeticException: BigInteger out of int range
Program 4: To demonstrate intValueExact() method for positive number >2,147,483,647. It will throw Arithmetic Exception
// Java program to demonstrate intValueExact()// method of BigInteger Class import java.math.*; public class GFG { public static void main(String[] args) { // Creating a BigInteger object BigInteger big = new BigInteger("3000000000"); // print value of BigInteger System.out.println("BigInteger value : " + big); try { // convert big to the int value int b1 = big.intValueExact(); // print int value System.out.println("int converted value : " + b1); } catch (Exception e) { System.out.println("Exception: " + e); } }} |
BigInteger value : 3000000000 Exception: java.lang.ArithmeticException: BigInteger out of int range
Reference: https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#intValueExact–
