Member Avatar for virtualvictory

Can anyone please help me in debugging this program.This is the implementation of linked list.I have not inserted delete function.I couldn't display the data in the list properly.

#include<stdio.h>
#include<conio.h>
#define NULL 0
struct node
{
 int info;
 struct node *next;
};
typedef struct node *nodeptr;
nodeptr getnode()
{
 nodeptr p;
 p=(nodeptr)malloc(sizeof(struct node));
 return(p);
}
nodeptr create(nodeptr p)
{
int r;
p=getnode();
printf("\n enter the value:");
scanf("%d",&r);
p->info=r;
p->next=NULL;
return p;
}
nodeptr search1(nodeptr p,int x)
{
 nodeptr n;
 n=getnode();
 for(n=p;n!=NULL;n=n->next)
 {
  if(n->info==x)
  {
      return n;
  }
  else
  {
  n=NULL;
  return n;
  }
 }
}
void insafter(nodeptr p,int x)
{
  nodeptr q;
  int a;
  printf("\n enter the no after which it has to be inserted:");
  scanf("%d",&a);
  if(p==NULL)
  {
   printf("\n cant insert:");
  }
  else if(p!=NULL)
  {
    q=getnode();
    q=search1(&p,x);
    if(q==NULL)
    {
    q->info=x;
    q->next=p->next;
    p->next=q;
    printf("%d\t%d",p->info,q->info);
    }
    else
    {
     printf("\n cant ins");
    }
  }
}

void display(nodeptr p)
{
 if(p==NULL)
 {
  printf("\n%d",p->info);
 }
 while(p!=NULL)
 {
  printf("\t%d",p->info);
  p=p->next;
 }
}
void main()
{
 nodeptr p1,p;
 int ch,n;
 clrscr();
 printf("\n 1.create\n2.insafter\n3.display\n4.exit");
 while(1)
 {
  printf("\n enter ur choice:");
  scanf("%d",&ch);
  switch(ch)
  {
  case 1:
  p=create(&p1);
  break;
  case 2:
  {
  int h;
  printf("\n enter the data:");
  scanf("%d",&h);
  insafter(&p,h);
  break;
  }
  case 3:
  display(&p);
  break;
  case 4:
  exit(1);
  default:
  printf("\n enter other choice:");
  break;
 }
 }
 getch();
}
  • 2 Contributors
  • 3 Replies
  • 74 Views
  • 6 Hours Discussion Span
  • Latest Post Latest Post by Ancient Dragon
Member Avatar for Ancient Dragon

what compiler are you using? Most modern compilers have debugging facilities that let you execute the program one line at a time and view the current value of variables.

Member Avatar for virtualvictory

I feel that there's nothing to deal with the compiler!I personally feel that there is some error in my coding!Can u please help me in fixing it!

Thanks in advance!

Member Avatar for Ancient Dragon

I didn't say it was a compiler error. Compilers rarely make errors. I said learn to use your compiler's debugger to find the problem in your code.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.