Untitled

#include<iostream>
using namespace std;

typedef struct node{
    int value;
    struct node* next;
}node_t;

node* createnode(int val){
    node* newnode=(node*)malloc(sizeof(node));
    newnode->value=val;
    newnode->next=NULL;
    return newnode;
}


node* insert_athead(node **head, node* nodename){  //(**pointer to a pointer)this directly changes head , address of head is passed
    nodename->next=(*head);
    (*head)=nodename;
    return nodename;
}



void reversell(node **head){
    node *prev=(node*)malloc(sizeof(node));
    node *forward=(node*)malloc(sizeof(node));
    node *curr=(node*)malloc(sizeof(node));
    prev=NULL;
    curr=*head;
    while(curr->next!=NULL){
        forward=curr->next;
        curr->next=prev;
        prev=curr;
        curr=forward;
    }
    *head=curr;
}


void prinll(node *hed){
    node *tmp=(node*)malloc(sizeof(node));
    tmp=hed;
    while(tmp!=NULL){
        cout<<tmp->value<<"-";
        tmp=tmp->next;
    }
    cout<<"\n";
}



int main(){
    node_t *n1;
    node* head=NULL;
    for(int i=3;i<=5;i++){
        n1=createnode(i);
        insert_athead(&head,n1);
    }
    prinll(head);
    reversell(&head);
    prinll(head);

}