Open In App

BigInteger intValueExact() Method in Java with Examples

Improve
Improve
Like Article
Like
Save
Share
Report

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);
    }
}


Output:

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);
    }
}


Output:

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);
        }
    }
}


Output:

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);
        }
    }
}


Output:

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–



Last Updated : 04 Dec, 2018
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads