# Java Math negateExact() method

The java.lang.Math.negateExact() is a built-in function in Java that returns the negation of the argument, throwing an exception if the result overflows the specified datatype either long or int depending on which data type has been used on the method argument. It throws an error when a data type int which has a minimum value of -2147483648 and the maximum value of 2147483647. So if we negate -2147483648 the result would be 2147483648 which already beyond the maximum value.

Syntax:

```int negateExact(int num)
long negateExact(long num)```

Parameters: The function accepts a single parameter as shown above and explained below:

• num – This parameter specifies the number whose negation has to be returned.

Return Value: The function returns the negation of the argument, throwing an exception if the result overflows the specified datatype either long or int depending on which data type has been used on the method argument

Examples:

```Input : 12
Output : -12

Input : -2
Output : 2
```

Program 1: The program below demonstrates the working of negateExact() method.

 `// Java program to demonstrate working ` `// of java.lang.Math.negateExact() method ` `import` `java.lang.Math; ` ` `  `class` `Gfg1 { ` ` `  `    ``// driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` ` `  `        ``int` `y = ``10``; ` `        ``System.out.println(Math.negateExact(y)); ` ` `  `        ``int` `x = -``12``; ` `        ``System.out.println(Math.negateExact(x)); ` `    ``} ` `} `

Output:

```-10
12```

Program 2: The program below demonstrates the overflow of negateExact() method.

 `// Java program to demonstrate overflow ` `// of java.lang.Math.negateExact() method ` `import` `java.lang.Math; ` ` `  `class` `Gfg1 { ` ` `  `    ``// driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` ` `  `        ``int` `y = Integer.MIN_VALUE; ` `        ``System.out.println(Math.negateExact(y)); ` `    ``} ` `} `

Output:

```Exception in thread "main" java.lang.ArithmeticException: integer overflow
at java.lang.Math.negateExact(Math.java:977)
at Gfg1.main(File.java:12)```

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