The multiplyHigh(long x, long y) method of Math class is used to return the most significant 64 bits from the 128-bit product of two 64-bit factors. This method takes two long values as input and a long is a 64-bit number. This method multiplies both long values and returns the most significant 64 bits from the product result which can be 128 bit long.
Syntax:
Java
Output:
Java
public static long multiplyHigh(long x, long y)Parameters: This method accepts two long x, y as parameter where x and y are argument we want to multiply. Return Value: This method returns the most significant 64 bits long value from the 128-bit product of two 64-bit numbersi.e. X * Y. Note: This method was added in JDK 9. Hence it wont run in Online IDE. Below programs illustrate the multiplyHigh() method: Program 1:
// Java program to demonstrate
// multiplyHigh() method of Math class
public class GFG {
// Main method
public static void main(String[] args)
{
// two long values
long a = 45267356745l, b = 45676556735l;
// apply multiplyHigh method
long c = Math.multiplyHigh(a, b);
// print result
System.out.println(a + " * "
+ b + " = "
+ c);
}
}
45267356745 * 45676556735 = 112Program 2: Multiplying two long contains Long.MAX values.
// Java program to demonstrate
// multiplyHigh() method of Math class
public class GFG {
// Main method
public static void main(String[] args)
{
// two Integer values
long a = Long.MAX_VALUE, b = Long.MAX_VALUE;
// apply multiplyHigh method
long c = Math.multiplyHigh(a, b);
// print result
System.out.println(a + " * "
+ b + " = " + c);
}
}
Output:
9223372036854775807 * 9223372036854775807 = 4611686018427387903References: https://docs.oracle.com/javase/10/docs/api/java/lang/Math.html#multiplyHigh(long, long)