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BigInteger intValueExact() Method in Java with Examples

• Last Updated : 04 Dec, 2018

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 doesnâ€™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 doesnâ€™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
```

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