# Java Math Class static long round(double d) with example

Java Math Class static long round(double d) method: Here, we are going to learn about the static long round(double d) method of Math Class with its syntax and example.
Submitted by Preeti Jain, on September 09, 2019

## Math Class static long round(double d)

• This method is available in java.lang package.
• This method is used to return the closest long value to the given argument.
• This is a static method, it is accessible with the class name too.
• The return type of this method is long, it returns the long type number which will be converted from double floating to long by adding 1/2 of the given argument.
• In this method, we pass only one parameter of a double type value.
• If the value of the given argument after the decimal point is greater than 4 then the value is incremented by 1 before the decimal point is returned else if the value of the given argument after the decimal point is less than or equal to 4 then the same value before the decimal point is returned.
• This method does not throw any exception.

Syntax:

```    public static long round(double d){
}
```

Parameter(s): d – a double value whose closest to long value to be found.

Note:

• If we pass "NaN" (Not a Number), it returns 0.
• If we pass negative infinity, it returns the "Long.MIN_VALUE".
• If we pass positive infinity, it returns the "Long.MAX_VALUE".
• If we pass the value which is less than or equal to "Long.MIN_VALUE", it returns "Long.MIN_VALUE".
• If we pass the value which is greater than or equal to "Long.MAX_VALUE", it returns "Long.MAX_VALUE".

Return value:

The return type of this method is long, it returns a long value which is the closest to long value of given parameter.

### Java program to demonstrate example of round(double d) method

```// Java program to demonstrate the example of
// round(double d) method of Math Class.

public class RoundMethod {
public static void main(String[] args) {
// declaring the variables
double d1 = -1.0 / 0.0;
double d2 = 1.0 / 0.0;
double d3 = 1234.56;
double d4 = 1234.42;

// Here , we will get (Long.MIN_VALUE) and we are
// passing parameter whose value is (-Infinity)
System.out.println("Math.round(d1): " + Math.round(d1));

// Here , we will get (Long.MAX_VALUE) and we are
// passing parameter whose value is (Infinity)
System.out.println("Math.round(d2): " + Math.round(d2));

// Here , we will get (1235) and we are
// passing parameter whose value is (1234.56)
System.out.println("Math.round(d3): " + Math.round(d3));

// Here , we will get (1234) and we are
// passing parameter whose value is (1234.12)
System.out.println("Math.round(d4): " + Math.round(d4));
}
}
```

Output

```E:\Programs>javac RoundMethod.java

E:\Programs>java RoundMethod
Math.round(d1): -9223372036854775808
Math.round(d2): 9223372036854775807
Math.round(d3): 1235
Math.round(d4): 1234
```

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