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Golang program to demonstrate the pointer to pointer

belongs to collection: Golang Pointer Programs

YasminRadwan26
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2022-07-03
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In this program, we will demonstrate the pointer to pointer. A pointer that holds the address of another pointer is known as a pointer to pointer or chain pointer.

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YasminRadwan26
2022-07-03
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Program/Source Code:

The source code to demonstrate the pointer to pointer is given below. The given program is compiled and executed successfully.

// Golang program to demonstrate the pointer to pointer

package main

import "fmt"

func main() {
	var num int = 10
	var ptr *int
	var pptr **int

	ptr = &num
	pptr = &ptr

	fmt.Printf("Num: %d\n", num)
	fmt.Printf("*Ptr: %d\n", *ptr)
	fmt.Printf("**PPtr: %d\n", **pptr)

	**pptr = 20

	fmt.Printf("Num: %d\n", num)
	fmt.Printf("*Ptr: %d\n", *ptr)
	fmt.Printf("**PPtr: %d\n", **pptr)
}

Output:

Num: 10
*Ptr: 10
**PPtr: 10
Num: 20
*Ptr: 20
**PPtr: 20

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt package that includes the files of package fmt then we can use a function related to the fmt package.

In the main() function, we created an integer variable num , an integer pointer ptr and chain pointer pptr. Then we initialized the pointer ptr using the address of variables num and pptr with the address of pointer ptr. After that, we access the value of the variable using dereferencing operator "*". Then modify and printed the value of the variable on the console screen.

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