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Java - Math.sqrt() method example

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Math sqrt is a static method that returns a number which is the square root of input value. The method works only on positive real numbers.

public class MathExample {

public static void main(String[] args) {
System.out.println( Math.sqrt(  4   ) ); //  2.0
System.out.println( Math.sqrt(  9   ) ); //  3.0

System.out.println( Math.sqrt(  2   ) ); //  1.4142135623730951
System.out.println( Math.sqrt(  0.5 ) ); //  0.7071067811865476
System.out.println( Math.sqrt(  0   ) ); //  0.0
System.out.println( Math.sqrt( -1   ) ); //  NaN
}
}

1. Documentation

 Syntax package java.lang; public final class Math { public static double sqrt(double number) { ... } } Note: Classes in the java.lang package are imported automatically, so it is not necessary to do it manually - we use just Math.sqrt() call. Parameters number - double value in the range 0 to +Infinity (primitive value). Result Square root number value in range 0 to +Infinity (primitive value). If the operation can not be executed NaN is returned. Description sqrt is a static method that returns a number which is square root of input value. The method works only on positive real numbers.

2. Square root with Math.pow method examples

In this example, the way how to calculate square root using power function is presented.

public class MathExample {

static double calculateSqrt(double value) {
return Math.pow(value, 0.5);
}

public static void main(String[] args) {
// Examples:
System.out.println( calculateSqrt(  4   ) ); //  2
System.out.println( calculateSqrt(  9   ) ); //  3

System.out.println( calculateSqrt(  2   ) ); //  1.4142135623730951
System.out.println( calculateSqrt(  0.5 ) ); //  0.7071067811865476
System.out.println( calculateSqrt(  0   ) ); //  0
System.out.println( calculateSqrt( -1   ) ); //  NaN
}
}
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