what is error in below code ?

Member • Jul 10, 2016

what is error in below code ?

#include 
#include
struct node
{
int data ;
struct node *next,*prev;
};
int main()
{
    int n ,m,a,count=0,i,j;
    char rot;
    scanf("%d",&n);
    fflush(stdin);
    scanf("%d",&m);
    fflush(stdin);
    printf("\n");
    struct node *head1=NULL,*rear1,*ptr,*temp,*head2=NULL,*rear2;
    if(head1==NULL)
    {
        temp=(struct node*)malloc(sizeof(struct node));
        scanf("%d ",temp->data);
        temp->next=NULL;
        head1=temp;
        ptr=head1;
        head1->prev=NULL;
    }
    for(i=1;i<=n-1;i++)
    {
        temp=(struct node*)malloc(sizeof(struct node));
        scanf("%d ",temp->data);
        ptr->next=temp;
        temp->prev=ptr;
        ptr=temp;
       
    }
    rear1=ptr;
    temp=NULL;
    ptr=NULL;
    printf("\n");
    if(head2==NULL)
    {
        temp=(struct node*)malloc(sizeof(struct node));
        scanf("%d ",temp->data);
        temp->next=NULL;
        head2=temp;
        ptr=head2;
    }
    for(i=1;i<=n-1;i++)
    {
        temp=(struct node*)malloc(sizeof(struct node));
        scanf("%d ",temp->data);
        ptr->next=temp;
        ptr=temp;
        ptr->next=NULL;
       
    }
    rear2=ptr;
    ptr=NULL;temp=NULL;
    printf("\n");
    for(i=0;inext;
            rear1->next=ptr;
            rear1=ptr;
            head1=temp;
            ptr=head1;
        }
        count++;
        ptr=NULL;
        temp=NULL;
        if(head1->data==head2->data && rear1->data==rear2->data)
        {
            break;
       
        }
    }
    else if(rot=='R')
    {
        temp=head1;
        ptr=rear1->prev;
       
        for(j=0;jprev=rear1;
            rear1->prev->next=NULL;
            rear1->next=temp;
            head1=rear1;
            temp=head1;
            rear1=ptr;
            ptr=rear1->prev;
       
        }
        count++;
        temp=NULL;
        ptr=NULL;
        printf("\n");
        if(head1->data==head2->data && rear1->data==rear2->data)
        {
            break;
       
        }
       
    }
    }
    printf("%d",count);
   
    return 0;
}

This is a snippet of code which accepts two arrays initial and target and 'm' operations in the form of R X and L X where L X is for left rotation by 1 and R X is for right rotation by 1 ,we have to output the no of operations after which initial and target array both are same , I created queues where head1 and head2 are pointers to front nodes of initial and target arrays , Now the issue is that after I scan the first operation , it stops working ,please tell the point where I am making mistake .

}

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aishwarya mk

Member • Jul 12, 2016

in scanf function u mis the "&" symbol u check once
in the line scanf("%d",&header1->data);
because data is integer data type

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brahmaasthra

Member • Jul 12, 2016

#include <stdio.h>
#include<malloc.h>
struct node
{
int data ;
struct node *next,*prev;
};
int main()
{
int n ,m,a,count=0,i,j;
char rot;
scanf("%d",&n);
fflush(stdin);
scanf("%d",&m);
fflush(stdin);
printf("\n");
struct node *head1=NULL,*rear1,*ptr,*temp,*head2=NULL,*rear2;
if(head1==NULL)
{
int inp;
temp=(struct node*)malloc(sizeof(struct node));
scanf("%d ",&inp);
temp->data=inp;
temp->next=NULL;
head1=temp;
ptr=head1;
head1->prev=NULL;
}
for(i=1;i<=n-1;i++)
{
int inp;
temp=(struct node*)malloc(sizeof(struct node));
scanf("%d ",&inp);
temp->data=inp;
ptr->next=temp;
temp->prev=ptr;
ptr=temp;

}
rear1=ptr;
temp=NULL;
ptr=NULL;
printf("\n");
if(head2==NULL)
{
int inp;
temp=(struct node*)malloc(sizeof(struct node));
scanf("%d ",&inp);
temp->data=inp;
temp->next=NULL;
head2=temp;
ptr=head2;
}
for(i=1;i<=n-1;i++)
{
int inp;
temp=(struct node*)malloc(sizeof(struct node));
scanf("%d ",&inp);
temp->data=inp;
ptr->next=temp;
ptr=temp;
ptr->next=NULL;

}
rear2=ptr;
ptr=NULL;temp=NULL;
printf("\n");
for(i=0;i<m;i++)
{
scanf("%c %d",&rot,&a);
fflush(stdin);

if(rot=='L')
{
ptr=head1;
for(j=0;j<a;j++)
{
temp=ptr->next;
rear1->next=ptr;
rear1=ptr;
head1=temp;
ptr=head1;
}
count++;
ptr=NULL;
temp=NULL;
if(head1->data==head2->data && rear1->data==rear2->data)
{
break;

}
}
else if(rot=='R')
{
temp=head1;
ptr=rear1->prev;

for(j=0;j<a;j++)
{
temp->prev=rear1;
rear1->prev->next=NULL;
rear1->next=temp;
head1=rear1;
temp=head1;
rear1=ptr;
ptr=rear1->prev;

}
count++;
temp=NULL;
ptr=NULL;
printf("\n");
if(head1->data==head2->data && rear1->data==rear2->data)
{
break;

}

}
}
printf("%d",count);

return 0;
}

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brahmaasthra

Member • Jul 12, 2016

copy and run this program and tell. Whether it works well?

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Vishal Sharma

Member • Jul 15, 2016

#-Link-Snipped-# No one asked you the entire code

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aishwarya mk

Member • Aug 4, 2016

scanf("%d ",temp->data);
for structure also u should specifies te data qualifiers

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