Create stack using array

Stack/stack usinf array

@@ -0,0 +1,63 @@
+#include <iostream>
+using namespace std;
+int stack[100], n=100, top=-1;
+void push(int val) {
+   if(top>=n-1)
+   cout<<"Stack Overflow"<<endl;
+   else {
+      top++;
+      stack[top]=val;
+   }
+}
+void pop() {
+   if(top<=-1)
+   cout<<"Stack Underflow"<<endl;
+   else {
+      cout<<"The popped element is "<< stack[top] <<endl;
+      top--;
+   }
+}
+void display() {
+   if(top>=0) {
+      cout<<"Stack elements are:";
+      for(int i=top; i>=0; i--)
+      cout<<stack[i]<<" ";
+      cout<<endl;
+   } else
+   cout<<"Stack is empty";
+}
+int main() {
+   int ch, val;
+   cout<<"1) Push in stack"<<endl;
+   cout<<"2) Pop from stack"<<endl;
+   cout<<"3) Display stack"<<endl;
+   cout<<"4) Exit"<<endl;
+   do {
+      cout<<"Enter choice: "<<endl;
+      cin>>ch;
+      switch(ch) {
+         case 1: {
+            cout<<"Enter value to be pushed:"<<endl;
+            cin>>val;
+            push(val);
+            break;
+         }
+         case 2: {
+            pop();
+            break;
+         }
+         case 3: {
+            display();
+            break;
+         }
+         case 4: {
+            cout<<"Exit"<<endl;
+            break;
+         }
+         default: {
+            cout<<"Invalid Choice"<<endl;
+         }
+      }
+   }while(ch!=4);
+   return 0;
+}