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Java sqrt() method with Examples
• Difficulty Level : Basic
• Last Updated : 09 Apr, 2018

The java.lang.Math.sqrt() returns the square root of a value of type double passed to it as argument. If the argument is NaN or negative, then the result is NaN. If the argument is positive infinity, then the result is positive infinity. If the argument passed is positive zero or negative zero then the result will be same as that of the argument.

Syntax:

```public static double sqrt(double a)
Parameter :
a : the value whose square root is to be returned.
Return :
This method returns the positive square root value of
the argument passed to it.
```

Example 1: To show working of java.lang.Math.sqrt() method.

 `// Java program to demonstrate working``// of java.lang.Math.sqrt() method``import` `java.lang.Math;`` ` `class` `Gfg {`` ` `    ``// driver code``    ``public` `static` `void` `main(String args[])``    ``{``        ``double` `a = ``30``;`` ` `        ``System.out.println(Math.sqrt(a));`` ` `        ``a = ``45``;`` ` `        ``System.out.println(Math.sqrt(a));`` ` `        ``a = ``60``;`` ` `        ``System.out.println(Math.sqrt(a));`` ` `        ``a = ``90``;`` ` `        ``System.out.println(Math.sqrt(a));``    ``}``}`

Output:

```5.477225575051661
6.708203932499369
7.745966692414834
9.486832980505138
```

Example 2: To show working of java.lang.Math.sqrt() method when argument is NaN or +infinity.

 `// Java program to demonstrate working``// of java.lang.Math.sqrt() method``import` `java.lang.Math; ``// importing java.lang package`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``double` `positiveInfinity = Double.POSITIVE_INFINITY;``        ``double` `negativeVal = -``5``;``        ``double` `nan = Double.NaN;``        ``double` `result;`` ` `        ``// Here argument is negative,``        ``// output will be NaN``        ``result = Math.sqrt(negativeVal);``        ``System.out.println(result);`` ` `        ``// Here argument is positive infinity,``        ``// output will also positive infinity``        ``result = Math.sqrt(positiveInfinity);``        ``System.out.println(result);`` ` `        ``// Here argument is NaN, output will be NaN``        ``result = Math.sqrt(nan);``        ``System.out.println(result);``    ``}``}`

Output:

```NaN
Infinity
NaN
```

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