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Golang Program to update the first node value in a linked list.
Example
Approach to solve this problem
Step 1 − Define a method that accepts the head of a linked list.
Step 2 − If head == nil, return the head.
Step 3 − Else, update the first node value to 29.
Example
package main
import "fmt"
type Node struct {
value int
next *Node
}
func NewNode(value int, next *Node) *Node{
var n Node
n.value = value
n.next = next
return &n
}
func TraverseLinkedList(head *Node){
temp := head
for temp != nil {
fmt.Printf("%d ", temp.value)
temp = temp.next
}
fmt.Println()
}
func UpdateFirstNodeValue(head *Node, data int) *Node{
if head == nil{
return head
}
head.value = data
return head
}
func main(){
head := NewNode(30, NewNode(10, NewNode(40, NewNode(40, nil))))
fmt.Printf("Input Linked list is: ")
TraverseLinkedList(head)
head = UpdateFirstNodeValue(head, 29)
fmt.Printf("After updating first node value, linked list is: ")
TraverseLinkedList(head)
}Output
Input Linked list is: 30 10 40 40 After updating first node value, linked list is: 29 10 40 40
Updated on: 18-Mar-2021
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