# Java Math round() method with Example

• Difficulty Level : Easy
• Last Updated : 11 Apr, 2018

The java.lang.Math.round() is a built-in math function which returns the closest long to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result after adding 1/2, and casting the result to type long.

• If the argument is NaN, the result is 0.
• If the argument is negative infinity or any value less than or equal to the value of Integer.MIN_VALUE, the result is equal to the value of Integer.MIN_VALUE.
• If the argument is positive infinity or any value greater than or equal to the value of Integer.MAX_VALUE, the result is equal to the value of Integer.MAX_VALUE.

Syntax:

```public static int round(float val)
Parameter:
val - floating-point value to be rounded to an integer.
```

Returns:
The method returns the value of the argument rounded to the nearest int value.

Example: To show working of java.lang.Math.round() function

 `// Java program to demonstrate working``// of java.lang.Math.round() method``import` `java.lang.Math;``   ` `class` `Gfg {``   ` `    ``// driver code``    ``public` `static` `void` `main(String args[])``    ``{``        ``// float numbers``      ``float` `x = ``4567``.9874f;`` ` `      ``// find the closest int for these floats``      ``System.out.println(Math.round(x));``       ` `      ``float` `y = -``3421``.134f;`` ` `      ``// find the closest int for these floats``      ``System.out.println(Math.round(y));  ``       ` `      ``double` `positiveInfinity = Double.POSITIVE_INFINITY;`` ` `      ``// returns the Integer.MAX_VALUE value when ``      ``System.out.println(Math.round(positiveInfinity));  ``       ` `    ``}``}`

Output:

```4568
-3421
9223372036854775807
```
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