added insert and delete first node in list

Author: hariprasadgurunathan

Data Structures/Linked Lists/Singly Linked List/simple_linkedlist_operations.cpp

@@ -0,0 +1,150 @@
+/*
+
+*/
+ 
+#include<iostream>
+#include <bits/stdc++.h>
+using namespace std;
+
+struct Node
+{
+    int data;
+    Node *next;
+
+};
+
+// inserts to the list at the beginning
+
+Node* insert_to_list(Node* head){
+
+    cout << "enter the number to be inserted in beginning : ";
+
+    int number;
+
+    cin >> number;
+
+    Node* temp = new Node();
+
+    temp -> data = number;
+
+    temp -> next = head;
+
+    head = temp;
+
+    return head;
+
+}
+
+// deletes the first node from list 
+
+Node* delete_from_list(Node* head){
+
+    // cout << "enter the number to be removed from list : ";
+
+    // int number;
+
+    // cin >> number;
+
+    Node* temp = new Node();
+
+    temp = head;
+
+    head  = head -> next;
+
+    delete temp;
+    
+    return head;
+
+}
+
+// prints list
+
+void print_list(Node* n){
+
+    while (n != NULL)
+    {
+        cout << n -> data << " ";
+        n = n -> next;
+    }
+    cout << endl;
+
+}
+
+ 
+int main()
+{
+    
+    Node* head = new Node();
+    Node* second = new Node();
+    Node* third = new Node();
+
+    head -> data = 1;
+    head -> next = second;
+
+    second -> data = 2;
+    second -> next = third;
+
+    third -> data = 3;
+    third -> next = NULL;
+
+    bool quit = false;
+    int choice;
+
+    while (!quit){
+
+        cout << "1. add to list begninnig" << endl
+             << "2. delete first node from list" << endl
+             << "3. print list" << endl
+             << "4. quit" << endl;
+
+        cin >> choice;
+        
+        switch(choice){
+
+            case 1: 
+            {
+                Node* temp = insert_to_list(head);
+                head = temp;
+                print_list(temp);
+                break;
+            }
+                
+            case 2: 
+            {
+                Node* temp = delete_from_list(head);
+                head = temp;
+                print_list(temp);
+                break;
+            }
+                
+            case 3: 
+            {
+                print_list(head);
+                break;
+            }
+            
+            case 4: 
+            {
+                quit = true;
+                break;
+            }
+                
+            default:{
+                cout << "That is not a valid input, quitting program";
+                quit = true;
+
+            }
+        }
+    }
+
+    // Node* temp = insert_node(head);
+
+    // print_list(temp);
+
+
+    // Node* temp = delete_node(head);
+
+    // print_list(temp);
+
+    return 0;
+}