bits.Mul64() Function in Golang with Examples

bits.Mul64() Function in Golang is used to find the 128-bit product of x and y. The execution time of this function does not depend on the inputs. To access this function, one needs to imports the math/bits package in the program.

Syntax:

func Mul64(x, y uint64) (hi, lo uint64)

Parameters: This function takes two parameter of uint64 type, i.e., x, y.

Note: (hi, lo) = x * y
Here, hi is the product bits’ upper half and, lo is the lower half returned.

Return Value: This function returns the 128-bit product of x and y.

Example 1:

// Golang program to illustrate
// bits.Mul64() Function
package main

import (
    "fmt"
    "math/bits"
)

// Main function
func main() {

    // Using Mul64() function
    hi, lo  := bits.Mul64(15, 25)
    fmt.Println("128-bit product of x and y : ", hi, lo)

}

Output:

128-bit product of x and y :  0 375

Example 2:

// Golang program to illustrate
// bits.Mul64() Function
package main

import (
    "fmt"
    "math/bits"
)

// Main function
func main() {

    // Using Mul64() function
    const a, b = 10, 30
    hi, lo  := bits.Mul64(a, b)
    fmt.Println("Number 1:", a)
    fmt.Println("Number 2:", b)
    fmt.Println("Upper half:", hi)
    fmt.Println("Lower half:", lo)

}

Output:

Number 1: 10
Number 2: 30
Upper half: 0
Lower half: 300