# bits.LeadingZeros() Function in Golang With Examples

• Last Updated : 19 Apr, 2020

bits.LeadingZeros() Function in Golang is used to find the number of the leading zero bits in the given number. If the given number is equal to zero, then this function will return UintSize. To access this function, one needs to imports the math/bits package in the program.

Syntax:

```func LeadingZeros64(x uint) int
```

Parameters: This function takes one parameter of uint type, i.e., x.

Return Value: This function returns a total number of leading zero bits in x.

Example 1:

 `// Golang program to illustrate ` `// bits.LeadingZeros() Function ` `package main ` `  `  `import ( ` `    ``"fmt"` `    ``"math/bits"` `) ` `  `  `// Main function ` `func main() { ` `  `  `    ``// Using LeadingZeros() function ` `    ``x := bits.LeadingZeros(5) ` `    ``fmt.Println(``"Total number of leading zero bits: "``, x) ` `  `  `} `

Output:

```Total number of leading zero bits:  61
```

Example 2:

 `// Golang program to illustrate ` `// bits.LeadingZeros() Function ` `package main ` `  `  `import ( ` `    ``"fmt"` `    ``"math/bits"` `) ` `  `  `// Main function ` `func main() { ` `  `  `    ``// Using LeadingZeros() function ` `    ``x := bits.LeadingZeros(0) ` `    ``fmt.Println(``"Total number of leading zero bits: "``, x) ` `  `  `} `

Output:

```Total number of leading zero bits:  64
```

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