Working with Singly Linked List

#include<stdio.h>
#include<conio.h>
#include<alloc.h>

struct node
{
int info;
struct node *rpt;
}*first;

void create()
{
struct node *ptr, *cpt;
char ch;

ptr=(struct node*)malloc(sizeof(struct node));    //Allocating memory to ptr

printf("Enter the information of first node: ");
scanf("%d",&ptr->info);

first=ptr;                                       //Initializing 'first'

do
{
cpt=(struct node*)malloc(sizeof(struct node));    //Allocating memory to cpt

printf("\nEnter the information of next node: ");
scanf("%d",&(cpt->info));

ptr->rpt=cpt;
ptr=cpt;

printf("\nPress <Y> for more nodes\n");
ch=getch();
}
while(ch=='y'||ch=='Y');

ptr->rpt=NULL;
}

void traverse()
{
struct node *ptr;
ptr=first;

if(ptr==NULL) printf("List is empty");

else
{
printf("\nThe Elements in the list are: ");
while(ptr!=NULL)
{
printf("\t%d",ptr->info);
ptr=ptr->rpt;
}
}
}

void binsert()
{
struct node *ptr;

ptr=(struct node*)malloc(sizeof(struct node));    //Allocating memory to ptr

printf("Enter the information of node: ");
scanf("%d",&ptr->info);

ptr->rpt=first;
first=ptr;
traverse();
}

void einsert()
{
struct node *ptr, *cpt;
cpt=first;

ptr=(struct node*)malloc(sizeof(struct node));    //Allocating memory to ptr

printf("Enter the information of node: ");
scanf("%d",&ptr->info);

while(cpt->rpt!=NULL)
{
cpt=cpt->rpt;
}
cpt->rpt=ptr;
cpt=ptr;
cpt->rpt=NULL;
traverse();
}

void dinsert()
{
struct node *ptr, *cpt;
int data;
cpt=first;

printf("Enter the node information after which you want to insert: ");
scanf("%d",&data);

while(cpt->info!=data)
{
cpt=cpt->rpt;
}

ptr=(struct node*)malloc(sizeof(struct node));    //Allocating memory to ptr

printf("Enter information of node to be inserted: ");
scanf("%d",&ptr->info);

ptr->rpt=cpt->rpt;
cpt->rpt=ptr;
traverse();
}

void bdel()
{
struct node *ptr;
ptr=first;

first=first->rpt;
free(ptr);
traverse();
}

void edel()
{
struct node *ptr, *cpt;
ptr=first;

if(ptr->rpt==NULL)
{
bdel();
}

else
{
while(ptr->rpt!=NULL)
{
cpt=ptr;
ptr=ptr->rpt;
}
cpt->rpt=NULL;
free(ptr);
traverse();
}
}

void ddel()
{
struct node *ptr, *cpt;
int data;
cpt=first;

printf("Enter the node information you want to delete: ");
scanf("%d",&data);

while(cpt->info!=data)
{
ptr=cpt;
cpt=cpt->rpt;
}

if(cpt==first)
{
bdel();
}

else
{
ptr->rpt=cpt->rpt;
free(cpt);
traverse();
}
}


void main()
{
clrscr();
char ch=1;
char choice;
printf("Working with Data Strucrure\n\n");
printf("Menu\n\n1. Create\n2. Insert at Beginning\n3. Insert After Given Info Node\n");
printf("4. Insert at End\n5. Delete Node From Beginning\n6. Delete Given Info Node\n");
printf("7. Delete Node From End\n8. Traverse\n0. Exit");

while(ch)
{
printf("\n\nEnter your choice: \n");
choice=getch();

switch(choice)
{
case '1': create();
break;

case '2': binsert();
break;

case '3': dinsert();
break;

case '4': einsert();
break;

case '5': bdel();
break;

case '6': ddel();
break;

case '7': edel();
break;

case '8': traverse();
break;

case '0': return;

default: printf("Wrong choice");
}
}
}