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Go Language Interface (Interfaces)Go Language Pointer Capacity

Go Language Pointer Length

In the pointer, you can uselen()This function finds the length of the pointer. It is a built-in function that will return the total number of elements in the pointer to an array, even if the specified pointer is nil. This function is defined in the built-in.

Syntax:

func len(l Type) int

Here,lThe type is a pointer. Let's discuss this concept with the given example:

Example of the length of a pointer to an array

package main
import (
　　　　"fmt"
)
func main() {
　　　　//Create and initialize
　　　　//Pointer to an array
　　　　//Using the var keyword
　　　　var ptr1　[6]*int
　　　　var ptr2　[3]*string
　　　　var ptr3　[4]*float64
　　　　//Find the length
　　　　//Pointer to an array
　　　　//Using the len function
　　　　fmt.Println("ptr1Length: ", len(ptr1))
　　　　fmt.Println("ptr2Length: ", len(ptr2))
　　　　fmt.Println("ptr3Length: ", len(ptr3))
}

Output:

ptr1Length:　　6
ptr2Length:　　3
ptr3Length:　　4

Example of the length of a pointer to an array2:

Example

//The length of a pointer to an array
package main
import (
　　　　"fmt"
)
func main() {
　　　　arr := [6]int{200,　300,400,　500,　600,　700}
　　　　var x int
　　　　//Create a pointer
　　　　var p [4]*int
　　　　//Allocate address
　　　　for x = 0; x < len(p); x++　{
　　　　　　　　p[x] = &arr[x]
　　　　}
　　　　//Display the result
　　　　for x = 0; x < len(p); x++　{
　　　　　　　　fmt.Printf("  p[%d] of ", x, d, " = ", d,　*p[x])
　　　　}
　　　　//　Using the len() function to find the length
　　　　fmt.Println("arr length: ", len(arr))
　　　　fmt.Println("p length: ", len(p))
}

Output:

　p[0] of　200
　p[1The value of　300
　p[2The value of　400
　p[3The value of　500
arr length:　　6
p length:　　4

Go Language Interface (Interfaces)Go Language Pointer Capacity