Some error with number of keyboard inputs occured with this code for reversing a string.. Post: 302535055

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Top Forums Programming Some error with number of keyboard inputs occured with this code for reversing a string.. Post 302535055 by mscoder on Wednesday 29th of June 2011 01:27:36 PM

06-29-2011

Registered User

Some error with number of keyboard inputs occured with this code for reversing a string..

i used a two-way linked list "node" for the code::

Code:

#include<stdio.h>
#include<malloc.h>

void insert();
void reverse();

struct node
{
	char c;
	struct node *next;
	struct node *back;
}*start=NULL;


int main()
{	
	int n,i;
	
	printf("Enter the size of the string to be reversed\n");
	scanf("%d",&n);
	printf("Now enter the %d character of the string one at a time",n);

	for(i=0;i<n;i++)
	{
		insert();
	}	
	
	reverse();	

	return(0);
}

void insert()

{	
        printf("\nEnter the character:\n");
	char w;
	scanf("%c",&w);

	struct node *tmp;

	tmp=malloc(sizeof(struct node));
        tmp->c=w;
        tmp->next=NULL;
        


        if(start==NULL)
                {
                       tmp->back=NULL;
                       start=tmp;
                }

        else
                {   
                        struct node *q;
                        q=start;
                     
                        while(q->next!=NULL)
                        {
                                q=q->next;
                        }
                     
                        tmp->back=q;
                        q->next=tmp;
                }
}	


void reverse()
{
	struct node *p=start;
	while(p->next!=NULL)
        {
                p=p->next;
        }


        printf("\nThe reversed string is :\n");


        while(p->back!=NULL)
        {
                printf("\t%c",p->c);
                p=p->back;
         }
}

mscoder

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LEARN ABOUT DEBIAN

list

list(3) 						    InterNetNews Documentation							   list(3)

NAME

       list - list routines

SYNOPSIS

	   #include <inn/list.h>

	   struct node {
	       struct node *succ;
	       struct node *pred;
	   };

	   struct list {
	       struct node *head;
	       struct node *tail;
	       struct node *tailpred;
	   };

	   void list_new(struct list *list);

	   struct node *list_addhead(struct list *list, struct node *node);

	   struct node *list_addtail(struct list *list, struct node *node);

	   struct node *list_head(struct list *list);

	   struct node *list_tail(struct list *list);

	   struct node *list_succ(struct node *node);

	   struct node *list_pred(struct node *node);

	   struct node *list_remhead(struct list *list);

	   struct node *list_remtail(struct list *list);

	   struct node *list_remove(struct node *node);

	   struct node *list_insert(struct list *list, struct node *node, struct node *pred);

	   bool list_isempty(struct list *list);

DESCRIPTION

       list_new initialises the list header list so as to create an empty list.

       list_addhead adds node to the head of list, returning the node just added.

       list_addtail adds node to the tail of list, returning the node just added.

       list_head returns a pointer to the the node at the head of list or NULL if the list is empty.

       list_tail returns a pointer to the the node at the tail of list or NULL if the list is empty.

       list_succ returns the next (successor) node on the list after node or NULL if node was the final node.

       list_pred returns the previous (predecessor) node on the list before node or NULL if node was the first node.

       list_remhead removes the first node from list and returns it to the caller. If the list is empty NULL is returned.

       list_remtail removes the last node from list and returns it to the caller. If the list is empty NULL is returned.

       list_remove removes node from the list it is on and returns it to the caller.

       list_insert inserts node onto list after the node pred. If pred is NULL then node is added to the head of list.

HISTORY

       Written by Alex Kiernan <alex.kiernan@thus.net> for InterNetNews 2.4.0.

       $Id: list.pod 9074 2010-05-31 19:01:32Z iulius $

INN 2.5.3							    2011-06-10								   list(3)

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