rename folder to data_structures

data_structures/stack_using_array.cpp

@@ -0,0 +1,56 @@
+#include <iostream>
+using namespace std;
+
+int *stack;
+int top = 0, size;
+
+void push(int x) {
+    if (top == size) {
+        cout << "\nOverflow";
+    } else {
+        stack[top++] = x;
+    }
+}
+
+void pop() {
+    if (top == 0) {
+        cout << "\nUnderflow";
+    } else {
+        cout << "\n" << stack[--top] << " deleted";
+    }
+}
+
+void show() {
+    for (int i = 0; i < top; i++) {
+        cout << stack[i] << "\n";
+    }
+}
+
+void topmost() { cout << "\nTopmost element: " << stack[top - 1]; }
+int main() {
+    cout << "\nEnter Size of stack : ";
+    cin >> size;
+    stack = new int[size];
+    int ch, x;
+    do {
+        cout << "\n1. Push";
+        cout << "\n2. Pop";
+        cout << "\n3. Print";
+        cout << "\n4. Print topmost element:";
+        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();
+        } else if (ch == 4) {
+            topmost();
+        }
+    } while (ch != 0);
+
+    return 0;
+}