Singly Linked List in C

Here you will find out about separately connected rundown in C.

What is the Singly Linked List (SLL)?

The most straightforward sort of connected rundown is a separately enjoyed rundown (SLL) which

has one connection for every hub. It has two sections, one section contains information and different contains

the address of the next hub. The structure of a hub in an SLL is given as in C:

struct node
{
    int data;
    struct node *next;
};

The program is given underneath that will perform inclusion, cancellation and show a separately connected rundown.

Singly Linked List in C

#include<stdio.h>
#include<conio.h>
#include<process.h>
 
struct node
{
    int data;
    struct node *next;
}*start=NULL,*q,*t;
 
int main()
{
    int ch;
    void insert_beg();
    void insert_end();
    int insert_pos();
    void display();
    void delete_beg();
    void delete_end();
    int delete_pos();
 
    while(1)
    {
        printf("\n\n---- Singly Linked List(SLL) Menu ----");
        printf("\n1.Insert\n2.Display\n3.Delete\n4.Exit\n\n");
        printf("Enter your choice(1-4):");
        scanf("%d",&ch);
 
        switch(ch)
        {
            case 1:
                    printf("\n---- Insert Menu ----");
                    printf("\n1.Insert at beginning\n2.Insert at end\n3.Insert at specified position\n4.Exit");
                    printf("\n\nEnter your choice(1-4):");
                    scanf("%d",&ch);
 
                    switch(ch)
                    {
                        case 1: insert_beg();
                                break;
                        case 2: insert_end();
                                break;
                        case 3: insert_pos();
                                break;
                        case 4: exit(0);
                        default: printf("Wrong Choice!!");
                    }
                    break;
 
            case 2: display();
                    break;
 
            case 3: printf("\n---- Delete Menu ----");
                    printf("\n1.Delete from beginning\n2.Delete from end\n3.Delete from specified position\n4.Exit");
                    printf("\n\nEnter your choice(1-4):");
                    scanf("%d",&ch);
 
                    switch(ch)
                    {
                        case 1: delete_beg();
                                break;
                        case 2: delete_end();
                                break;
                        case 3: delete_pos();
                                break;
                        case 4: exit(0);
                        default: printf("Wrong Choice!!");
                    }
                    break;
            case 4: exit(0);
                    default: printf("Wrong Choice!!");
        }
    }
    return 0;
}
 
void insert_beg()
{
    int num;
    t=(struct node*)malloc(sizeof(struct node));
    printf("Enter data:");
    scanf("%d",&num);
    t->data=num;
 
    if(start==NULL)        //If list is empty
    {
        t->next=NULL;
        start=t;
    }
    else
    {
        t->next=start;
        start=t;
    }
}
 
void insert_end()
{
    int num;
    t=(struct node*)malloc(sizeof(struct node));
    printf("Enter data:");
    scanf("%d",&num);
    t->data=num;
    t->next=NULL;
 
    if(start==NULL)        //If list is empty
    {
        start=t;
    }
    else
    {
        q=start;
        while(q->next!=NULL)
        q=q->next;
        q->next=t;
    }
}
 
int insert_pos()
{
    int pos,i,num;
    if(start==NULL)
    {
        printf("List is empty!!");
        return 0;
    }
 
    t=(struct node*)malloc(sizeof(struct node));
    printf("Enter data:");
    scanf("%d",&num);
    printf("Enter position to insert:");
    scanf("%d",&pos);
    t->data=num;
 
    q=start;
    for(i=1;i<pos-1;i++)
    {
        if(q->next==NULL)
        {
            printf("There are less elements!!");
            return 0;
        }
 
        q=q->next;
    }
 
    t->next=q->next;
    q->next=t;
    return 0;
}
 
void display()
{
    if(start==NULL)
    {
        printf("List is empty!!");
    }
    else
    {
        q=start;
        printf("The linked list is:\n");
        while(q!=NULL)
        {
            printf("%d->",q->data);
            q=q->next;
        }
    }
}
 
void delete_beg()
{
    if(start==NULL)
    {
        printf("The list is empty!!");
    }
    else
    {
        q=start;
        start=start->next;
        printf("Deleted element is %d",q->data);
        free(q);
    }
}
 
void delete_end()
{
    if(start==NULL)
    {
        printf("The list is empty!!");
    }
    else
    {
        q=start;
        while(q->next->next!=NULL)
        q=q->next;
 
        t=q->next;
        q->next=NULL;
        printf("Deleted element is %d",t->data);
        free(t);
    }
}
 
int delete_pos()
{
    int pos,i;
 
    if(start==NULL)
    {
        printf("List is empty!!");
        return 0;
    }
 
    printf("Enter position to delete:");
    scanf("%d",&pos);
 
    q=start;
    for(i=1;i<pos-1;i++)
    {
        if(q->next==NULL)
        {
            printf("There are less elements!!");
            return 0;
        }
        q=q->next;
    }
 
    t=q->next;
    q->next=t->next;
    printf("Deleted element is %d",t->data);
    free(t);
 
    return 0;
}

Output

—- Singly Linked List(SLL) Menu —-
1.Insert
2.Display
3.Delete
4.ExitEnter your choice(1-4):1—- Insert Menu —-
1.Insert at beginning
2.Insert at end
3.Insert at specified position
4.ExitEnter your choice(1-4):1
Enter data:4—- Singly Linked List(SLL) Menu —-
1.Insert
2.Display
3.Delete
4.ExitEnter your choice(1-4):2
The linked list is:
4->
—- Singly Linked List(SLL) Menu —-
1.Insert
2.Display
3.Delete
4.Exit

Enter your choice(1-4):4