rename folder to data_structures

data_structures/stack_using_linked_list.cpp

@@ -0,0 +1,57 @@
+#include <iostream>
+using namespace std;
+
+struct node {
+    int val;
+    node *next;
+};
+
+node *top;
+
+void push(int x) {
+    node *n = new node;
+    n->val = x;
+    n->next = top;
+    top = n;
+}
+
+void pop() {
+    if (top == NULL) {
+        cout << "\nUnderflow";
+    } else {
+        node *t = top;
+        cout << "\n" << t->val << " deleted";
+        top = top->next;
+        delete t;
+    }
+}
+
+void show() {
+    node *t = top;
+    while (t != NULL) {
+        cout << t->val << "\n";
+        t = t->next;
+    }
+}
+
+int main() {
+    int ch, x;
+    do {
+        cout << "\n1. Push";
+        cout << "\n2. Pop";
+        cout << "\n3. Print";
+        cout << "\nEnter Your Choice : ";
+        cin >> ch;
+        if (ch == 1) {
+            cout << "\nInsert : ";
+            cin >> x;
+            push(x);
+        } else if (ch == 2) {
+            pop();
+        } else if (ch == 3) {
+            show();
+        }
+    } while (ch != 0);
+
+    return 0;
+}