The method **sqrt(long x, RoundingMode mode)** of Guava’s LongMath Class accepts two parameters and calculates the square root of the first parameter rounded according to the rounding mode specified by the second parameter.

**Syntax:**

public static long sqrt(long x, RoundingMode mode)

**Parameters:** This method takes two parameters:

**x:**is a long value of whose square root is to be found.**mode:**is the rounding mode according to which the rounding is to be done.

**Return Value:** This method returns **square root of x**, rounded according to the specified rounding mode.

**Exceptions:** This method throws following parameters:

**IllegalArgumentException:**if x < 0.**ArithmeticException:**if mode is RoundingMode.UNNECESSARY and sqrt(x) is not an integer.

#### Enum RoundingMode

Enum Constant | Description |
---|---|

CEILING | Rounding mode to round towards positive infinity. |

DOWN | Rounding mode to round towards zero. |

FLOOR | Rounding mode to round towards negative infinity. |

HALF_DOWN | Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round down. |

HALF_EVEN | Rounding mode to round towards the “nearest neighbor” unless both neighbors are equidistant, in which case, round towards the even neighbor. |

HALF_UP | Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round up. |

UNNECESSARY | Rounding mode to assert that the requested operation has an exact result, hence no rounding is necessary. |

UP | Rounding mode to round away from zero. |

Below given are some examples to understand the implementation in a better way:

**Example 1:**

`// Java code to show implementation of` `// sqrt(long x, RoundingMode mode) method` `// of Guava's LongMath class` ` ` `import` `java.math.RoundingMode;` `import` `com.google.common.math.LongMath;` ` ` `class` `GFG {` ` ` ` ` `// Driver code` ` ` `public` `static` `void` `main(String args[])` ` ` `{` ` ` `long` `x1 = ` `524` `;` ` ` ` ` `// Using sqrt(long x, RoundingMode mode)` ` ` `// method of Guava's LongMath class` ` ` `// The RoundingMode HALF_EVEN rounds towards` ` ` `// the nearest neighbor unless both neighbors` ` ` `// are equidistant, in which case, round towards` ` ` `// the even neighbor.` ` ` `long` `ans1` ` ` `= LongMath.sqrt(x1,` ` ` `RoundingMode.HALF_EVEN);` ` ` ` ` `System.out.println(` `"Square root of "` `+ x1` ` ` `+ ` `" is : "` `+ ans1);` ` ` ` ` `long` `x2 = ` `316` `;` ` ` ` ` `// Using sqrt(long x, RoundingMode mode)` ` ` `// method of Guava's LongMath class` ` ` `// The RoundingMode FLOOR rounds towards` ` ` `// negative infinity.` ` ` `long` `ans2` ` ` `= LongMath.sqrt(x2,` ` ` `RoundingMode.FLOOR);` ` ` ` ` `System.out.println(` `"Square root of "` `+ x2` ` ` `+ ` `" is : "` `+ ans2);` ` ` `}` `}` |

**Output:**

Square root of 524 is : 23 Square root of 316 is : 17

**Example 2:**

`// Java code to show implementation of` `// sqrt(long x, RoundingMode mode) method` `// of Guava's LongMath class` ` ` `import` `java.math.RoundingMode;` `import` `com.google.common.math.LongMath;` ` ` `class` `GFG {` ` ` ` ` `// Driver code` ` ` `public` `static` `void` `main(String args[])` ` ` `{` ` ` `int` `x = -` `65` `;` ` ` ` ` `try` `{` ` ` `// Using sqrt(long x, RoundingMode mode)` ` ` `// method of Guava's LongMath class` ` ` `// The RoundingMode HALF_EVEN rounds towards` ` ` `// the nearest neighbor unless both neighbors` ` ` `// are equidistant, in which case, round towards` ` ` `// the even neighbor.` ` ` ` ` `// This should throw "IllegalArgumentException"` ` ` `// as x < 0` ` ` `long` `ans1 = LongMath.sqrt(x,` ` ` `RoundingMode.HALF_EVEN);` ` ` `}` ` ` `catch` `(Exception e) {` ` ` `System.out.println(e);` ` ` `}` ` ` `}` `}` |

**Output:**

java.lang.IllegalArgumentException: x (-65) must be >= 0

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