**`decrementExact(x: Int)`** is a function in the `Math` package of Scala that *decreases the argument by 1* and returns it.

# 
#  Syntax

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```
def decrementExact(x: Int): Int
```
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# 
#  Parameters
The function takes in one parameter, `x`, of type `int`.

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## Return value

The `decrementExact()` function returns the value of `x` decreased by 1, i.e., $x-1$.

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> The function throws `ArithmeticException` if `int` is overflowed by the return value.

##
## Code

object MainObject {
  def main(args: Array[String]): Unit = {
    var x : Int = 130;
    println("Math.decrementExact(x) = " + Math.decrementExact(x)); 
  }
}

What is decrementExact(x: Int) in Scala?

Reduces an integer by 1, returns the result, and throws an exception on overflow.