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bits.Mul64() Function in Golang with Examples
• Last Updated : 28 Apr, 2020

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
```

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