int main()
{
NODE *head,*temp;
head=(NODE *)malloc(sizeof(NODE));
temp=(NODE *)malloc(sizeof(NODE));
head=NULL;
START:
printf("ENTER YOUR CHOICE\n");
printf("1->INSERT AT BEGNIBG\n");
printf("2->DELETE AT BEGNING\n");
printf("3->EXIT\n");
int choice,val;
scanf("%d",&choice);
switch(choice)
{
case 1:
scanf("%d",&val);
insert_beg(&head,val);
break;
case 2:
temp=del_beg(&head);
if(temp==NULL)
printf("EMPTY LIST\n");
else
printf("%d\n",temp->data);
break;
case 3:
exit(1);
default:
printf("INVALID CHOICE PLEASE TRY AGAIN\n");
}
goto START;
return 0;
}
//Main function
int main()
{
int choice,n;
while(1)
{
printf("\n1. Insert at beginning\n2. Insert at End\n3. Delete from beginning\n4. Delete from End\n5. Display total\n6. Count elements\n7. Exit");
printf("\nEnter your choice ");
scanf("%d",&choice);
switch(choice)
{
case 1 : printf("Enter data : ");
scanf("%d", &n);
insert_beg(n);
break;
case 2 : printf("Enter data : ");
scanf("%d", &n);
insert_end(n);
break;
case 3: del_beg();
break;
case 4: del_end();
break;
case 5 : display();
break;
case 6: link_count();
break;
case 7: exit(1);
default : printf("Wrong entry please enter correct choice !!! ");
break;
}
}
}
int main()
{
head = NULL;
while(1){
printf("1.INSERT : \n2.DELETE : \n3.SEARCH : \n4.DISPLAY : \n");
int ch;
scanf("%d",&ch);
if (ch==1)
{
int roll;
char name[100];
float cgpa;
printf("Enter ROLL NO. to be inserted\n");
scanf("%d",&roll);
printf("Enter NAME to be inserted\n");
gets(name);
printf("Enter CGPA to be inerted\n");
scanf("%f",&cgpa);
insert(roll,name,cgpa);
}
else if(ch==2){
int ch1;
printf("1.DELETE at BEGINNING: \n2.DELETE at END: \n3.DELETE at BETWEEN:\n");
scanf("%d",&ch1);
if(ch1==1){
del_beg();
}
else if(ch1==2){
del_end();
}
else if(ch1==3){
printf("Enter the POSITION at which node is to be DELETED\n");
int k;
del_btw(scanf("%d",&k));
}
else printf("INVALID INPUT");
}
else if(ch==3){
int roll;
printf("Enter ROLL NO. to be searched\n");
scanf("%d",&roll);
search(roll);
}
else if(ch==4)DISPLAY();
else {printf("INVALID INPUT\n");break;}
}
return 0;
}
//Main Execution
void main()
{
int a,i;
clrscr();
while(1)
{
printf("\n1.insert_beg\n");
printf("2.insert_end\n");
printf("3.display\n");
printf("4.del_beg\n");
printf("5.del_end\n");
printf("6.del_after\n");
printf("7.insert_befroe\n");
printf("8.exit\n");
printf("\n");
printf("enter a choice:");
scanf("%d",&a);
switch(a)
{
case 1:insert_beg();
break;
case 2:insert_end();
break;
case 3:display();
break;
case 4:del_beg();
break;
case 5:del_end();
break;
case 6:del_after();
break;
case 7:insert_before();
break;
case 8:
exit(1);
default:
printf("enter a valid choice");
}
}
}
